South Dakota Attorney General Marty Jackley speaks outside the Supreme Court after the court hears oral arguments on a case involving a rule stemming from two, decades-old Supreme Court cases on state's sales tax collection, Tuesday, April 17, 2018, in Washington. South Dakota v. Wayfair is a case arguing about whether a rule the Supreme Court announced decades ago in a case involving a catalog retailer should still apply in the age of the internet. (AP Photo/Andrew Harnik)