L to R, U.S. Sen. <a gi-track='captionPersonalityLinkClicked' href=/galleries/search?phrase=John+Barrasso&family=editorial&specificpeople=5312607 ng-click='$event.stopPropagation()'>John Barrasso</a> (R-WY), U.S. Sen. <a gi-track='captionPersonalityLinkClicked' href=/galleries/search?phrase=John+Thune&family=editorial&specificpeople=534356 ng-click='$event.stopPropagation()'>John Thune</a> (R-SD), and Senate Majority Leader <a gi-track='captionPersonalityLinkClicked' href=/galleries/search?phrase=Mitch+McConnell&family=editorial&specificpeople=217985 ng-click='$event.stopPropagation()'>Mitch McConnell</a> (R-KY) speak to the media during a news conference after a policy meeting with Senate Republicans, on Capitol Hill, April 28, 2015 in Washington, DC. The Senate began debate on Tuesday on legislation granting Congress the ability to review and possibly reject any nuclear deal the United States makes with Iran.