opinion: Justice THOMAS delivered the opinion of the Court.
  Federal habeas courts reviewing convictions from state courts will not consider claims that a state court refused to hear based on an adequate and independent state procedural ground. A state prisoner may be able to overcome this bar, however, if he can establish "cause" to excuse the procedural default and demonstrate that he suffered actual prejudice from the alleged error. An attorney error does not qualify as "cause" to excuse a procedural default unless the error amounted to constitutionally ineffective assistance of counsel. Because a prisoner does not have a constitutional right to counsel in state postconviction proceedings, ineffective assistance in those proceedings does not qualify as cause to excuse a procedural default. See Coleman v. Thompson, 501 U.S. 722, 111 S.Ct. 2546, 115 L.Ed.2d 640 (1991).
  In Martinez v. Ryan, 566 U.S. 1, 132 S.Ct. 1309, 182 L.Ed.2d 272 (2012), and Trevino v. Thaler, 569 U.S. 413, 133 S.Ct. 1911, 185 L.Ed.2d 1044 (2013), this Court announced a narrow exception to Coleman 's general rule. That exception treats ineffective assistance by a prisoner's state postconviction counsel as cause to overcome the default of a single claim-ineffective assistance of trial counsel-in a single context-where the State effectively requires a defendant to bring that claim in state postconviction proceedings rather than on direct appeal. The question in this case is whether we should extend that exception to allow federal courts to consider a different kind of defaulted claim-ineffective assistance of appellate counsel. We decline to do so.
  I
  A
  On April 6, 2008, a group of family and friends gathered at Annette Stevenson's home to celebrate her granddaughter's birthday. Petitioner Erick Daniel Davila, believing he had seen a member of a rival street gang at the celebration, fired a rifle at the group while they were eating cake and ice cream. He shot and killed Annette and her 5-year-old granddaughter Queshawn, and he wounded three other children and one woman.
  After the police arrested petitioner, he confessed to the killings. He stated that he "wasn't aiming at the kids or the woman," but that he was trying to kill Annette's son (and Queshawn's father) Jerry Stevenson and the other "guys on the porch." App. 38. The other "guys on the porch" were, apparently, women.
  The State indicted petitioner for capital murder under Tex. Penal Code Ann. § 19.03(a)(7)(A) (West 2016), which makes it a capital crime to "murde[r] more than one person ... during the same criminal transaction." In response to the jury's request for clarification during deliberations, the trial court proposed instructing the jury on transferred intent. Under that doctrine, the jury could find petitioner guilty of murder if it determined that he intended to kill one person but instead killed a different person. Petitioner's counsel objected to the additional instruction, arguing that the trial judge should "wait" to submit it "until the jury indicates that they can't reach ... a resolution." App. 51. The trial court overruled the objection and submitted the instruction to the jury. The jury convicted petitioner of capital murder, and the trial court sentenced petitioner to death.
  B
  Petitioner appealed his conviction and sentence. Although his appellate counsel argued that the State presented insufficient evidence to show that he acted with the requisite intent, counsel did not challenge the instruction about transferred intent. The Texas Court of Criminal Appeals affirmed petitioner's conviction and sentence. Davila v. State, 2011 WL 303265 (Jan. 26, 2011), cert. denied, 565 U.S. 885, 132 S.Ct. 258, 181 L.Ed.2d 150 (2011).
  Petitioner next sought habeas relief in Texas state court. His counsel did not challenge the instruction about transferred intent, nor did he challenge the failure of his appellate counsel to raise the alleged instructional error on direct appeal. The Texas Court of Criminal Appeals denied relief. Ex parte Davila, 2013 WL 1655549 (Apr. 17, 2013), cert. denied, 571 U.S. ----, 134 S.Ct. 784, 187 L.Ed.2d 597 (2013).
  C
  Petitioner then sought habeas relief in Federal District Court under 28 U.S.C. § 2254. As relevant here, he argued that his appellate counsel provided ineffective assistance by failing to challenge the jury instruction about transferred intent. Petitioner conceded that he had failed to raise his claim of ineffective assistance of appellate counsel in his state habeas petition, but argued that the failure was the result of his state habeas counsel's ineffective assistance. Petitioner invoked this Court's decisions in Martinez and Trevino to argue that his state habeas attorney's ineffective assistance provided cause to excuse the procedural default of his claim of ineffective assistance of appellate counsel.
  The District Court denied petitioner's § 2254 petition. It concluded that Martinez and Trevino did not supply cause to excuse the procedural default of petitioner's claim of ineffective assistance of appellate counsel because those decisions applied exclusively to claims of ineffective assistance of trial counsel. See Davila v. Stephens, 2015 WL 1808689, *20 (N.D.Tex., Apr. 21, 2015). The Court of Appeals for the Fifth Circuit denied a certificate of appealability on the same ground. 650 Fed.Appx. 860, 867-868 (2016). Petitioner then sought a writ of certiorari, asking us to reverse the Fifth Circuit on the ground that Martinez and Trevino should be extended to claims of ineffective assistance of appellate counsel. We granted certiorari, 580 U.S. ----, 137 S.Ct. 810, 196 L.Ed.2d 597 (2017), and now affirm.
  II
  Our decision in this case is guided by two fundamental tenets of federal review of state convictions. First, a state prisoner must exhaust available state remedies before presenting his claim to a federal habeas court. § 2254(b)(1)(A). The exhaustion requirement is designed to avoid the "unseemly" result of a federal court "upset[ting] a state court conviction without" first according the state courts an "opportunity to ... correct a constitutional violation," Rose v. Lundy, 455 U.S. 509, 518, 102 S.Ct. 1198, 71 L.Ed.2d 379 (1982) (internal quotation marks omitted).
  Second, a federal court may not review federal claims that were procedurally defaulted in state court-that is, claims that the state court denied based on an adequate and independent state procedural rule. E.g., Beard v. Kindler, 558 U.S. 53, 55, 130 S.Ct. 612, 175 L.Ed.2d 417 (2009). This is an important "corollary" to the exhaustion requirement. Dretke v. Haley, 541 U.S. 386, 392, 124 S.Ct. 1847, 158 L.Ed.2d 659 (2004). "Just as in those cases in which a state prisoner fails to exhaust state remedies, a habeas petitioner who has failed to meet the State's procedural requirements for presenting his federal claims has deprived the state courts of an opportunity to address" the merits of "those claims in the first instance." Coleman, 501 U.S., at 731-732, 111 S.Ct. 2546. The procedural default doctrine thus advances the same comity, finality, and federalism interests advanced by the exhaustion doctrine. See McCleskey v. Zant, 499 U.S. 467, 493, 111 S.Ct. 1454, 113 L.Ed.2d 517 (1991).
  A state prisoner may overcome the prohibition on reviewing procedurally defaulted claims if he can show "cause" to excuse his failure to comply with the state procedural rule and "actual prejudice resulting from the alleged constitutional violation." Wainwright v. Sykes, 433 U.S. 72, 84, 97 S.Ct. 2497, 53 L.Ed.2d 594 (1977) ; Coleman, supra, at 750, 111 S.Ct. 2546 To establish "cause"-the element of the doctrine relevant in this case-the prisoner must "show that some objective factor external to the defense impeded counsel's efforts to comply with the State's procedural rule." Murray v. Carrier, 477 U.S. 478, 488, 106 S.Ct. 2639, 91 L.Ed.2d 397 (1986). A factor is external to the defense if it "cannot fairly be attributed to" the prisoner. Coleman, supra, at 753, 111 S.Ct. 2546
  It has long been the rule that attorney error is an objective external factor providing cause for excusing a procedural default only if that error amounted to a deprivation of the constitutional right to counsel. See Edwards v. Carpenter, 529 U.S. 446, 451, 120 S.Ct. 1587, 146 L.Ed.2d 518 (2000). An error amounting to constitutionally ineffective assistance is "imputed to the State" and is therefore external to the prisoner. Murray, supra, at 488, 106 S.Ct. 2639. Attorney error that does not violate the Constitution, however, is attributed to the prisoner "under well-settled principles of agency law." Coleman, supra, at 754, 111 S.Ct. 2546 It follows, then, that in proceedings for which the Constitution does not guarantee the assistance of counsel at all, attorney error cannot provide cause to excuse a default. Thus, in Coleman, this Court held that attorney error committed in the course of state postconviction proceedings-for which the Constitution does not guarantee the right to counsel, see Murray v. Giarratano, 492 U.S. 1, 109 S.Ct. 2765, 106 L.Ed.2d 1 (1989) (plurality opinion)-cannot supply cause to excuse a procedural default that occurs in those proceedings. 501 U.S., at 755, 111 S.Ct. 2546.
  In Martinez, this Court announced a narrow, "equitable ... qualification" of the rule in Coleman that applies where state law requires prisoners to raise claims of ineffective assistance of trial counsel "in an initial-review collateral proceeding," rather than on direct appeal. Martinez, 566 U.S., at 16, 17, 132 S.Ct. 1309. It held that, in those situations, "a procedural default will not bar a federal habeas court from hearing a substantial claim of ineffective assistance at trial if" the default results from the ineffective assistance of the prisoner's counsel in the collateral proceeding. Id., at 17, 132 S.Ct. 1309. In Trevino, the Court clarified that this exception applies both where state law explicitly prohibits prisoners from bringing claims of ineffective assistance of trial counsel on direct appeal and where the State's "procedural framework, by reason of its design and operation, makes it unlikely in a typical case that a defendant will have a meaningful opportunity to raise" that claim on direct appeal. 569 U.S., at ----, 133 S.Ct., at 1921.
  III
  Petitioner asks us to extend Martinez to allow a federal court to hear a substantial, but procedurally defaulted, claim of ineffective assistance of appellate counsel when a prisoner's state postconviction counsel provides ineffective assistance by failing to raise that claim. We decline to do so.
  A
  On its face, Martinez provides no support for extending its narrow exception to new categories of procedurally defaulted claims. Martinez did not purport to displace Coleman as the general rule governing procedural default. Rather, it "qualifie[d] Coleman by recognizing a narrow exception" that applies only to claims of "ineffective assistance of counsel at trial" and only when, "under state law," those claims "must be raised in an initial-review collateral proceeding." Martinez, supra, at 9, 17, 132 S.Ct. 1309. And Trevino merely clarified that the exception applies whether state law explicitly or effectively forecloses review of the claim on direct appeal. 569 U.S., at ----, 133 S.Ct., at 1914-1915, 1920-1921. In all but those "limited circumstances," Martinez made clear that "[t]he rule of Coleman governs." 566 U.S., at 16, 132 S.Ct. 1309. Applying Martinez 's highly circumscribed, equitable exception to new categories of procedurally defaulted claims would thus do precisely what this Court disclaimed in Martinez : Replace the rule of Coleman with the exception of Martinez .
  B
  Petitioner also finds no support in the underlying rationale of Martinez . Petitioner's primary argument is that his claim of ineffective assistance of appellate counsel might never be reviewed by any court, state or federal, without expanding the exception to the rule in Coleman . He argues that this situation is analogous to Martinez, where the Court expressed that same concern about claims of ineffective assistance of trial counsel. But the Court in Martinez was principally concerned about trial errors -in particular, claims of ineffective assistance of trial counsel. Ineffective assistance of appellate counsel is not a trial error. Nor is petitioner's rule necessary to ensure that a meritorious trial error (of any kind) receives review.
  1
  Petitioner argues that allowing a claim of ineffective assistance of appellate counsel to evade review is just as concerning as allowing a claim of ineffective assistance of trial counsel to evade review. Brief for Petitioner 12; see also id., at 18-26. We do not agree.
  The criminal trial enjoys pride of place in our criminal justice system in a way that an appeal from that trial does not. The Constitution twice guarantees the right to a criminal trial, see Art. III, § 2; Amdt. 6, but does not guarantee the right to an appeal at all, Halbert v. Michigan, 545 U.S. 605, 610, 125 S.Ct. 2582, 162 L.Ed.2d 552 (2005). The trial "is the main event at which a defendant's rights are to be determined," McFarland v. Scott, 512 U.S. 849, 859, 114 S.Ct. 2568, 129 L.Ed.2d 666 (1994) (internal quotation marks omitted), "and not simply a tryout on the road to appellate review," Freytag v. Commissioner, 501 U.S. 868, 895, 111 S.Ct. 2631, 115 L.Ed.2d 764 (1991) (Scalia, J., concurring in part and concurring in judgment) (internal quotation marks omitted). And it is where the stakes for the defendant are highest, not least because it is where a presumptively innocent defendant is adjudged guilty, see Ross v. Moffitt, 417 U.S. 600, 610, 94 S.Ct. 2437, 41 L.Ed.2d 341 (1974) ; Wainwright, 433 U.S., at 90, 97 S.Ct. 2497 and where the trial judge or jury makes factual findings that nearly always receive deference on appeal and collateral review, see Jackson v. Virginia, 443 U.S. 307, 318-319, 99 S.Ct. 2781, 61 L.Ed.2d 560 (1979) ; see also Cavazos v. Smith, 565 U.S. 1, 2, 132 S.Ct. 2, 181 L.Ed.2d 311 (2011) (per curiam ) (under deferential standard of review, "judges will sometimes encounter convictions that they believe to be mistaken, but that they must nevertheless uphold").
  The Court in Martinez made clear that it exercised its equitable discretion in view of the unique importance of protecting a defendant's trial rights, particularly the right to effective assistance of trial counsel. As the Court explained, "the limited nature" of its holding "reflect[ed] the importance of the right to the effective assistance of trial counsel," which is "a bedrock principle in our justice system." 566 U.S., at 12, 16, 132 S.Ct. 1309 (emphasis added). In declining to expand the Martinez exception to the distinct context of ineffective assistance of appellate counsel, we do no more than respect that judgment.
  2
  Petitioner's rule also is not required to ensure that meritorious claims of trial error receive review by at least one state or federal court-the chief concern identified by this Court in Martinez . See id ., at 10, 12, 132 S.Ct. 1309. Martinez was concerned that a claim of trial error-specifically, ineffective assistance of trial counsel-might escape review in a State that required prisoners to bring the claim for the first time in state postconviction proceedings rather than on direct appeal. Because it is difficult to assess a trial attorney's performance until the trial has ended, a trial court ordinarily will not have the opportunity to rule on such a claim. And when the State requires a prisoner to wait until postconviction proceedings to raise the claim, the appellate court on direct appeal also will not have the opportunity to review it. If postconviction counsel then fails to raise the claim, no state court will ever review it. Finally, because attorney error in a state postconviction proceeding does not qualify as cause to excuse procedural default under Coleman, no federal court could consider the claim either.
  Claims of ineffective assistance of appellate counsel, however, do not pose the same risk that a trial error-of any kind-will escape review altogether, at least in a way that could be remedied by petitioner's proposed rule. This is true regardless of whether trial counsel preserved the alleged error at trial. If trial counsel preserved the error by properly objecting, then that claim of trial error "will have been addressed by ... the trial court." Martinez, 566 U.S., at 11, 132 S.Ct. 1309. A claim of appellate ineffectiveness premised on a preserved trial error thus does not present the same concern that animated the Martinez exception because at least "one court" will have considered the claim on the merits. Ibid. ; see also Coleman, 501 U.S., at 755-756, 111 S.Ct. 2546.
  If trial counsel failed to preserve the error at trial, then petitioner's proposed rule ordinarily would not give the prisoner access to federal review of the error, anyway. Effective appellate counsel should not raise every nonfrivolous argument on appeal, but rather only those arguments most likely to succeed. Smith v. Murray, 477 U.S. 527, 536, 106 S.Ct. 2661, 91 L.Ed.2d 434 (1986) ; Jones v. Barnes, 463 U.S. 745, 751-753, 103 S.Ct. 3308, 77 L.Ed.2d 987 (1983). Declining to raise a claim on appeal, therefore, is not deficient performance unless that claim was plainly stronger than those actually presented to the appellate court. See Smith v. Robbins, 528 U.S. 259, 288, 120 S.Ct. 746, 145 L.Ed.2d 756 (2000). In most cases, an unpreserved trial error will not be a plainly stronger ground for appeal than preserved errors. See 2 B. Means, Postconviction Remedies § 35:19, p. 627, and n. 16 (2016). Thus, in most instances in which the trial court did not rule on the alleged trial error (because it was not preserved), the prisoner could not make out a substantial claim of ineffective assistance of appellate counsel and therefore could not avail himself of petitioner's expanded Martinez exception.
  Adopting petitioner's proposed rule would be unnecessary to ensure review of a claim of trial error even when a prisoner has a legitimate claim of ineffective assistance of appellate counsel based on something other than a preserved trial error. If an unpreserved trial error was so obvious that appellate counsel was constitutionally required to raise it on appeal, then trial counsel likely provided ineffective assistance by failing to object to it in the first instance. In that circumstance, the prisoner likely could invoke Martinez or Coleman to obtain review of trial counsel's failure to object. Similarly, if the underlying, defaulted claim of trial error was ineffective assistance of trial counsel premised on something other than the failure to object, then Martinez and Coleman again already provide a vehicle for obtaining review of that error in most circumstances. Petitioner's proposed rule is thus unnecessary for ensuring that trial errors are reviewed by at least one court.
  C
  The Court in Martinez also was responding to an equitable consideration that is unique to claims of ineffective assistance of trial counsel and accordingly inapplicable to claims of ineffective assistance of appellate counsel. In Martinez, the State "deliberately cho[se] to move trial-ineffectiveness claims outside of the direct-appeal process, where counsel is constitutionally guaranteed," into the postconviction review process, where we have never held that the Constitution guarantees a right to counsel. 566 U.S., at 13, 132 S.Ct. 1309 ; id., at 9, 132 S.Ct. 1309. By doing so, "the State significantly diminishe[d] prisoners' ability to file such claims." Id., at 13, 132 S.Ct. 1309. Similarly, in Trevino, the State had chosen a procedural framework pursuant to which collateral review was, "as a practical matter, the onl[y] method for raising an ineffective-assistance-of-trial-counsel claim." 569 U.S., at ----, 133 S.Ct., at 1920.
  Although this Court acknowledged in Martinez that there was nothing inappropriate about the State's choice, it explained that the choice was "not without consequences for the State's ability to assert a procedural default" in subsequent federal habeas proceedings. 566 U.S., at 13, 132 S.Ct. 1309. Specifically, the Court concluded that it would be inequitable to refuse to hear a defaulted claim of ineffective assistance of trial counsel when the State had channeled that claim to a forum where the prisoner might lack the assistance of counsel in raising it.
  The States have not made a similar choice with respect to claims of ineffective assistance of appellate counsel-nor could they. By their very nature, such claims generally cannot be presented until after the termination of direct appeal. Put another way, they necessarily must be heard in collateral proceedings, where counsel is not constitutionally guaranteed. The fact that claims of appellate ineffectiveness are considered in proceedings in which counsel is not constitutionally guaranteed is a function of the nature of the claim, not of the State's "deliberat[e] cho[ice] to move ... claims outside of the direct-appeal process." Ibid. The equitable concerns raised in Martinez therefore do not apply.
  D
  Finally, the Court in Martinez grounded its decision in part on the belief that its narrow exception was unlikely to impose significant systemic costs. See id., at 15-16, 132 S.Ct. 1309. The same cannot be said of petitioner's proposed extension.
  1
  Adopting petitioner's argument could flood the federal courts with defaulted claims of appellate ineffectiveness. For one thing, every prisoner in the country could bring these claims. Martinez currently applies only to States that deliberately choose to channel claims of ineffective assistance of trial counsel into collateral proceedings. See, e.g., Lee v. Corsini, 777 F.3d 46, 60-61 (C.A.1 2015)
  (Martinez and Trevino do not apply to Massachusetts); Henness v. Bagley, 766 F.3d 550, 557 (C.A.6 2014) (Martinez does not apply to Ohio). If we applied Martinez to claims of appellate ineffectiveness, however, we would bring every State within Martinez 's ambit, because claims of appellate ineffectiveness necessarily must be heard in collateral proceedings. See supra, at 2068.
  Extending Martinez to defaulted claims of ineffective assistance of appellate counsel would be especially troublesome because those claims could serve as the gateway to federal review of a host of trial errors, while Martinez covers only one trial error (ineffective assistance of trial counsel). If a prisoner can establish ineffective assistance of trial counsel under Martinez, he ordinarily is entitled to a new trial. See United States v. Morrison, 449 U.S. 361, 364-365, 101 S.Ct. 665, 66 L.Ed.2d 564 (1981) ; see also Hagens v. State, 979 S.W.2d 788, 792 (Tex.App.1998). But if he cannot, Martinez provides no avenue for litigating other defaulted trial errors.
  An expanded Martinez exception, however, would mean that any defaulted trial error could result in a new trial. In Carpenter, this Court held that, when a prisoner can show cause to excuse a defaulted claim of ineffective assistance of appellate counsel, he can in turn rely on that claim as cause to litigate an underlying claim of trial error that was defaulted due to appellate counsel's ineffectiveness. 529 U.S., at 453, 120 S.Ct. 1587. Expanding Martinez as petitioner suggests would thus produce a domino effect: Prisoners could assert their postconviction counsel's inadequacy as cause to excuse the default of their appellate ineffectiveness claims, and use those newly reviewable appellate ineffectiveness claims as cause to excuse the default of their underlying claims of trial error. Petitioner's rule thus could ultimately knock down the procedural barriers to federal habeas review of nearly any defaulted claim of trial error. The scope of that review would exceed anything the Martinez Court envisioned when it established its narrow exception to Coleman .
  Petitioner insists that these concerns are overstated because many of the newly raised claims will be meritless. See Brief for Petitioner 28. But even if that were true, courts would still have to undertake the task of separating the wheat from the chaff. And we are not reassured by petitioner's suggestion that extending Martinez would increase only the number of claims in each petition rather than the number of federal habeas petitions themselves. Reply Brief 14. Each additional claim would require the district court to review the prisoner's trial record, appellate briefing, and state postconviction record to determine the claim's viability. This effort could be repeated at each level of federal review. We cannot "assume that these costs would be negligible," Murray, 477 U.S., at 487, 106 S.Ct. 2639 and we are loath to further "burden ... scarce federal judicial resources" in this way, McCleskey, 499 U.S., at 491, 111 S.Ct. 1454.
  2
  Expanding Martinez would not only impose significant costs on the federal courts, but would also aggravate the harm to federalism that federal habeas review necessarily causes. Federal habeas review of state convictions "entails significant costs," Engle v. Isaac, 456 U.S. 107, 126, 102 S.Ct. 1558, 71 L.Ed.2d 783 (1982), " 'and intrudes on state sovereignty to a degree matched by few exercises of federal judicial authority,' " Harrington v. Richter, 562 U.S. 86, 103, 131 S.Ct. 770, 178 L.Ed.2d 624 (2011) (quoting Harris v. Reed, 489 U.S. 255, 282, 109 S.Ct. 1038, 103 L.Ed.2d 308 (1989) (KENNEDY, J., dissenting)). It "frustrates both the States' sovereign power to punish offenders and their good-faith attempts to honor constitutional rights." Calderon v. Thompson, 523 U.S. 538, 555-556, 118 S.Ct. 1489, 140 L.Ed.2d 728 (1998) (internal quotation marks omitted). It "degrades the prominence of the [State] trial," Engle, supra, at 127, 102 S.Ct. 1558 and it "disturbs the State's significant interest in repose for concluded litigation [and] denies society the right to punish some admitted offenders," Harrington, supra, at 103, 131 S.Ct. 770 (internal quotation marks omitted).
  Apart from increasing the sheer frequency of federal intrusion into state criminal affairs, petitioner's proposed rule would also undermine the doctrine of procedural default and the values it serves. That doctrine, like the federal habeas statute generally, is designed to ameliorate the injuries to state sovereignty that federal habeas review necessarily inflicts by giving state courts the first opportunity to address challenges to convictions in state court, thereby "promoting comity, finality, and federalism." Cullen v. Pinholster, 563 U.S. 170, 185, 131 S.Ct. 1388, 179 L.Ed.2d 557 (2011) ; McCleskey, supra, at 493, 111 S.Ct. 1454. Expanding the narrow exception announced in Martinez would unduly aggravate the "special costs on our federal system" that federal habeas review already imposes. Engle, supra, at 128, 102 S.Ct. 1558.
  3
  Not only would these burdens on the federal courts and our federal system be severe, but the benefit would-as a systemic matter-be small. To be sure, permitting a state prisoner to bring a meritorious constitutional claim that could not otherwise be heard is beneficial to that prisoner. Petitioner's counsel concedes, however, that relief is granted in, "[i]f any, a very minute number" of "post-conviction ineffective assistance of appellate counsel cases." Tr. of Oral Arg. 14. Indeed, he concedes that the number of meritorious cases is "infinitesimally small." Ibid. We think it is likely that the claims heard in federal court because of petitioner's proposed rule would also be largely meritless, given that the proposed rule would generally affect only those cases in which the trial court already adjudicated, and rejected, the prisoner's argument regarding the alleged underlying trial error. See supra, at 2068. Given that petitioner's proposed rule would likely generate high systemic costs and low systemic benefits, and that the unique concerns of Martinez are not implicated in cases like his, we do not think equity requires an expansion of Martinez .
  * * *
  For the foregoing reasons, we affirm the judgment of the Court of Appeals.
  It is so ordered.
  Justice BREYER, with whom Justice GINSBURG, Justice SOTOMAYOR, and Justice KAGAN join, dissenting.
  As the Court explains, normally a federal habeas court cannot hear a state prisoner's claim that his trial lawyer was, constitutionally speaking, "ineffective" if the prisoner failed to assert that claim in state court at the appropriate time, that is, if he procedurally defaulted the claim. See ante, at 2062 (the prisoner's failure to raise his federal claim at the initial-review state collateral proceeding amounts to an "adequate and independent state procedural ground" for denying habeas relief).
  But there are equitable exceptions. In Martinez v. Ryan, 566 U.S. 1, 132 S.Ct. 1309, 182 L.Ed.2d 272 (2012), and later in Trevino v. Thaler, 569 U.S. 413, 133 S.Ct. 1911, 185 L.Ed.2d 1044 (2013), we held that, despite the presence of a procedural default, a federal court can nonetheless hear a prisoner's claim that his trial counsel was ineffective, where (1) the framework of state procedural law "makes it highly unlikely in a typical case that a defendant will have a meaningful opportunity to raise a claim of ineffective assistance of trial counsel on direct appeal," id., at 429, 133 S.Ct. 1911 ; (2) in the state " 'initial-review collateral proceeding, there was no counsel or counsel in that proceeding was ineffective,' " ibid. (quoting Martinez, 566 U.S., at 17, 132 S.Ct. 1309 ); and (3) "the underlying ineffective-assistance-of-trial-counsel claim is a substantial one, which is to say that the prisoner must demonstrate that the claim has some merit," id., at 14, 132 S.Ct. 1309.
  In my view, this same exception (with the same qualifications) should apply when a prisoner raises a constitutional claim of ineffective assistance of appellate counsel. See, e.g., Evitts v. Lucey, 469 U.S. 387, 396, 105 S.Ct. 830, 83 L.Ed.2d 821 (1985) (Constitution guarantees a defendant an effective appellate counsel, just as it guarantees a defendant an effective trial counsel).
  I
  Two simple examples help make clear why I believe Martinez and Trevino should govern the outcome of this case.
  Example One: Ineffective assistance of trial counsel . The prisoner claims that his trial lawyer was ineffective, say, because counsel failed to object to an obviously unfair jury selection, failed to point out that the prosecution had promised numerous benefits to its main witness in return for the witness' testimony, or failed to object to an erroneous jury instruction that made conviction and imposition of the death penalty far more likely. Next suppose the prisoner appeals but, per state law, may not bring his ineffective-assistance claim until collateral review in state court (i.e., state habeas corpus), where the prisoner will have a better opportunity to develop his claim and the attorney will be better able to explain his (perhaps strategic) reasons for his actions at trial. Suppose that, on collateral review, the prisoner fails to bring up his ineffective-assistance claim, perhaps because he is no longer represented by counsel or because his counsel there is ineffective. Under these circumstances, if his ineffective-assistance claim is a "substantial" one, i.e., it has "some merit," then Martinez and Trevino hold that a federal court can hear the claim even though the state habeas court did not consider it. See Trevino, supra, at 429, 133 S.Ct. 1911 ; Martinez, supra, at 14, 132 S.Ct. 1309. The fact that the prisoner had no lawyer in the initial state habeas proceeding (or his lawyer in that proceeding was ineffective) constitutes grounds for excusing the procedural default.
  Example Two: Ineffective assistance of appellate counsel . Now suppose that a prisoner claims that the trial court made an important error of law, say, improperly instructing the jury, or that the prosecution engaged in misconduct. He believes his lawyer on direct appeal should have raised those errors because they led to his conviction or (as here) a death sentence.
  The appellate lawyer's failure to do so, the prisoner might claim, amounts to ineffective assistance of appellate counsel. The prisoner cannot make this argument on direct appeal, for the direct appeal is the very proceeding in which he is represented by the lawyer he says was ineffective. Next suppose the prisoner fails to raise his appellate lawyer's ineffectiveness at the initial state habeas proceeding, either because he was not represented by counsel in that proceeding or because his counsel there also was ineffective. When he brings his case to the federal habeas court, the State contends that the prisoner's failure to present his claim during the initial state habeas proceeding constitutes a procedural default that precludes federal review of his claim.
  Given Martinez and Trevino, the prisoner in the first example who complains about his trial counsel can overcome the procedural default but, in the Court's view today, the prisoner in the second example who complains about his appellate counsel cannot. Why should the law treat the second prisoner differently? Why should the Court not apply the rules of Martinez and Trevino to claims of ineffective assistance of both trial and appellate counsel?
  II
  As I have said, the Constitution applies similarly to both prisoners: It guarantees them effective assistance of counsel at both trial and during an initial appeal. See Strickland v. Washington, 466 U.S. 668, 686, 104 S.Ct. 2052, 80 L.Ed.2d 674 (1984) (trial); Evitts, supra, at 396, 105 S.Ct. 830 (appeal). Moreover, the reasoning of Martinez and Trevino applies similarly to both situations.
  Four features of the claim of ineffective assistance of trial counsel led the Martinez Court to its conclusion. Each equally applies here. First, the Court stressed the importance of the underlying constitutional right to effective assistance of trial counsel, describing it as "a bedrock principle in our justice system." 566 U.S., at 12, 132 S.Ct. 1309. Our cases make clear that the constitutional right to effective assistance of appellate counsel is also critically important. The Court wrote in Douglas v. California, 372 U.S. 353, 357, 83 S.Ct. 814, 9 L.Ed.2d 811 (1963), that "where the merits of the one and only appeal ... as of right are decided without benefit of counsel, we think an unconstitutional line has been drawn between rich and poor." The Court held in Evitts that "[a] first appeal as of right ... is not adjudicated in accord with due process of law if the appellant does not have the effective assistance of an attorney." 469 U.S., at 396, 105 S.Ct. 830. The Court added that "the promise of Gideon [v. Wainwright, 372 U.S. 335, 83 S.Ct. 792, 9 L.Ed.2d 799 (1963),] that a criminal defendant has a right to counsel at trial ... would be a futile gesture unless it comprehended the right to the effective assistance of counsel" "on appeal." Id., at 397, 105 S.Ct. 830. And we stated in Martinez itself that "if the attorney appointed by the State to pursue the direct appeal is ineffective, the prisoner has been denied fair process." 566 U.S., at 11, 132 S.Ct. 1309 (citing Coleman v. Thompson, 501 U.S. 722, 754, 111 S.Ct. 2546, 115 L.Ed.2d 640 (1991) ; Evitts, supra, at 396, 105 S.Ct. 830 ; Douglas, supra, at 357-358, 83 S.Ct. 814 ). The fact that, according to Department of Justice statistics, nearly a third of convictions or sentences in capital cases are overturned at some stage of review suggests the practical importance of the appeal right, particularly in a capital case such as this one. See Dept. of Justice, Bureau of Justice Statistics, Capital Punishment, 2013-Statistical Tables, p. 19, (rev. Dec. 2014) (Table 16); see also Brief for National Association of Criminal Defense Lawyers et al. as Amici Curiae 10.
  Second, we pointed out in Martinez that the "initial" state collateral review proceeding "is the first designated proceeding for a prisoner to raise a claim of ineffective assistance at trial." 566 U.S., at 11, 132 S.Ct. 1309. We added that it "is in many ways the equivalent of a prisoner's direct appeal as to the ineffective-assistance claim." Ibid. In Trevino, we applied Martinez despite the theoretical possibility that a prisoner might raise an ineffective-assistance-of-trial-counsel claim on direct appeal. We wrote that the State's procedural system denied prisoners a "meaningful opportunity" to bring ineffective-assistance claims on appeal; in effect, it required them to raise the claim for the first time in state collateral review proceedings. 569 U.S., at 429, 133 S.Ct. 1911.
  This consideration applies a fortiori where the constitutional claim at issue is ineffective assistance of appellate counsel. The prisoner cannot raise that kind of claim in the very appeal in which he claims his counsel was ineffective. See Ha Van Nguyen v. Curry, 736 F.3d 1287, 1294-1295 (C.A.9 2013). It makes no difference that the nature of the claim, rather than the State's express rule, makes that so. See Trevino, supra, at 429, 133 S.Ct. 1911 (extending Martinez where the "state procedural framework, by reason of its design and operation, makes it highly unlikely in a typical case that a defendant will have a meaningful opportunity to raise" the claim on direct appeal); Trevino, supra, at 424, 133 S.Ct. 1911 (referring to "the inherent nature of most ineffective assistance of trial counsel claims" (emphasis added; internal quotation marks omitted)); see also Martinez, 566 U.S., at 19-20, n. 1, 132 S.Ct. 1309 (Scalia, J., dissenting) (There is no "relevant difference between cases in which the State says that certain claims can only be brought on collateral review and cases in which those claims by their nature can only be brought on collateral review").
  Third, Martinez pointed out that, unless "counsel's errors in an initial-review collateral proceeding ... establish cause to excuse the procedural default in a federal habeas proceeding, no court will review the prisoner's claims." Id., at 10-11, 132 S.Ct. 1309 (majority opinion). The same is true when the prisoner claims ineffective assistance of appellate counsel.
  The Court argues to the contrary. It says that at least one court-namely, the trial court-will have considered the underlying legal error. Ante, at 2067 - 2068. (If not, perhaps trial counsel was ineffective.) But I believe the Court here misses the point. The prisoner's complaint is about the ineffectiveness of his appellate counsel. That ineffectiveness could consist, for example, in counsel's failure to appeal 10 different erroneous decisions of the trial court. The fact that the trial court made those decisions (assuming they are erroneous) does not help the prisoner. To the contrary, it forms the basis of his ineffectiveness claim. In the absence of a Martinez -like rule, the prisoner here (and prisoners in similar cases) would receive no review of their ineffective-assistance claims. Moreover, there will be cases in which no court will consider the underlying trial error, either. Suppose that, during the pendency of the appeal, appellate counsel learns of a Brady violation, juror misconduct, judicial bias, or some similar violation whose basis was not known during the trial. See Brady v. Maryland, 373 U.S. 83, 83 S.Ct. 1194, 10 L.Ed.2d 215 (1963). And suppose appellate counsel fails to pursue the claim in the manner prescribed by state law. Without the exception petitioner here seeks, no court will hear either the appellate-ineffective-assistance claim or the underlying Brady, misconduct, or bias claim.
  Fourth, the Martinez Court believed that its decision would "not ... put a significant strain on state resources." 566 U.S., at 15, 132 S.Ct. 1309. That is because Martinez imposed limiting conditions: It excuses only those defaults that (1) occur at the initial-review collateral proceeding; (2) where prisoner had no counsel, or ineffective counsel, in that proceeding; and (3) where the underlying claim of ineffective assistance is "substantial," i.e., has "some merit." Id., at 14-16, 132 S.Ct. 1309. Moreover, as the Court pointed out, because many States provide prisoners with counsel in initial-review collateral proceedings (or at least when the prisoner seems to have a meritorious claim), it is unlikely that prisoners will default substantial ineffective-assistance claims. See id., at 14-15, 132 S.Ct. 1309 (providing examples). Finally, there is no evidence before us that Martinez has produced a greater-than-expected increase in courts' workload, even though Martinez applies, as Texas concedes, "in most States." Tr. of Oral Arg. 38.
  It therefore seems unlikely that applying Martinez to ineffective-assistance-of-appellate-counsel claims will "put a significant strain on" state or federal resources. As I have said, the same limitations as the Court placed upon the assertion of a Martinez claim would apply here. And the Court's fear of triggering federal second-guessing of many, if not all, trial errors is of no greater concern here than it was in Martinez, for both trial- and appellate-level ineffectiveness claims "could serve as the gateway to federal review of a host of trial errors." Ante, at 2069. Given a natural judicial hesitation to second-guess counsels' decisions, it is not surprising that we have no significant evidence of defaulted claims of ineffective assistance with "some merit" flooding the federal courts, either in respect to trial counsel (as in Martinez ) or in respect to appellate counsel (as here). See Strickland, 466 U.S., at 690-691, 104 S.Ct. 2052 (To prevail on an ineffective-assistance claim, the defendant must show that his attorney's actions "were outside the wide range of professionally competent assistance," rather than strategic decisions to which the court must defer, and that those actions had an "effect on the judgment").
  In fact, Texas has supplied some empirical evidence, but that evidence suggests that courts can manage a Martinez exception expanded to include claims of ineffective assistance of appellate counsel. Texas says that in the Ninth Circuit, which has applied Martinez to ineffective-assistance-of-appellate-counsel claims since late 2013, petitioners have used the expanded version of Martinez "in dozens" of federal habeas cases. Brief for Respondent 37. (Texas specifically refers to 10 cases, in only 1 of which the petitioner prevailed. Ibid., n. 13.) During that period, state prisoners filed at least 7,500 federal habeas petitions in the Ninth Circuit. See Ninth Circuit Ann. Rep. 71 (2015) (2,468 cases referred to magistrate judges in 2014; 2,693 in 2015). Hence, Texas' estimate of added workload comes down to an increase of "dozens" of cases out of 7,500 cases in total. That figure represents an increase, but not an increase significant enough to warrant depriving a prisoner of any forum to adjudicate a substantial claim that he was deprived of his constitutional right to effective assistance of appellate counsel.
  III
  In my view, the Court's effort to distinguish Martinez comes down to the following points: (1) Martinez concerned only claims of ineffective trial counsel; (2) Martinez involved trial errors that, at least sometimes, would have escaped review, while here at least one court (the trial court) may have reviewed the underlying legal error; (3) Martinez involved cases in which the State itself prevented its appellate courts from reviewing the claim of trial counsel's ineffectiveness, whereas here it is the nature of the ineffectiveness claim that prevents the appellate courts from reviewing it; and (4) extending Martinez could flood the federal system with normally meritless claims.
  I have explained why I believe the last mentioned empirical prediction does not distinguish Martinez and why, in any event, it is unlikely to prove correct. See supra, at 2074 - 2075. And I have explained why the second and third points do not successfully distinguish Martinez . The second fails to focus on the relevant claim: ineffective assistance of counsel. See supra, at 2073 - 2074. And it fails to acknowledge that there may be cases in which the trial court will not have considered the legal error underlying the ineffective-assistance claim. Ibid. The third has little to do with the matter. It overlooks the fact that there is no "relevant difference" between cases in which the State requires that certain claims be brought only on collateral review and "cases in which those claims by their nature can only be brought on collateral review," such as claims of ineffective assistance of appellate counsel. See supra, at 2073 (quoting Martinez, 566 U.S., at 19-20, n. 1, 132 S.Ct. 1309 (Scalia, J., dissenting)). In both cases, the State's scheme deprives a prisoner from having his substantial constitutional claim heard, through no fault of his own.
  As to the first point, the Court is of course right. Martinez had to do only with the ineffectiveness of trial counsel. But our cases make clear that due process requires a criminal defendant to have effective assistance of appellate counsel as well. See supra, at 2072. Indeed, effective trial counsel and appellate counsel are inextricably connected elements of a fair trial.
  The basic legal principle that should determine the outcome of this case is the principle that requires courts to treat like cases alike. To put the matter more familiarly, what is sauce for the goose is sauce for the gander. The dissent in Martinez wrote that there "is not a dime's worth of difference in principle between [ineffective-assistance-of-trial-counsel] cases and many other cases in which initial state habeas will be the first opportunity for a particular claim to be raised," including "claims asserting ineffective assistance of appellate counsel." 566 U.S., at 19, 132 S.Ct. 1309 (opinion of Scalia, J.). I agree.
  With respect, I dissent.
  The Fifth Circuit treats unexhausted claims as procedurally defaulted if "the court to which the petitioner would be required to present his claims in order to meet the exhaustion requirement would now find the claims procedurally barred." Bagwell v. Dretke, 372 F.3d 748, 755 (2004) (internal quotation marks omitted); cf. Coleman, 501 U.S., at 735, 111 S.Ct. 2546, n. Relying on this doctrine, the District Court concluded that petitioner's federal claim was procedurally defaulted (even though a state court had never actually found it procedurally barred) because Texas law would likely bar a Texas court from deciding the claim on the merits if petitioner were to present it in a successive habeas petition. Davila v. Stephens, 2015 WL 1808689, *19-*20 (N.D.Tex., Apr. 21, 2015) (citing Davila v. Stephens, 2014 WL 5879879, *2 (N.D.Tex., Nov. 10, 2014) ); see also Davila v. Stephens, 2014 WL 6057907, *2 (N.D.Tex., Nov. 10, 2014). Petitioner did not seek a certificate of appealability regarding that holding, and neither petitioner nor the State disputes in this Court that the claim was procedurally defaulted. Accordingly, we assume that it was procedurally defaulted for purposes of this case.
  The dissent argues that Martinez already provides a gateway to the review of underlying trial errors no differently than would petitioner's proposed rule. See post, at 2074 (opinion of BREYER, J.). That is not so. If a prisoner succeeds on his claim of ineffective assistance of trial counsel under Martinez, the federal habeas court would not need to consider any other claim of trial error since the successful claim of trial ineffectiveness-unlike a successful claim of ineffective assistance of appellate counsel-entitles the prisoner to a new trial. See 7 W. LaFave, J. Israel, N. King, & O. Kerr, Criminal Procedure § 28.4(d), p. 258, n. 75 (4th ed. 2015).