Senate Minority Leader Harry Reid, Nevada Democrat, discusses the Iran nuclear agreement during his speech at the Carnegie Endowment for International Peace in Washington on Sept. 8, 2015. Lawmakers returning to Washington from their summer recess are plunging immediately into bitter, partisan debate over the Iran nuclear accord. The deal struck by Iran, the U.S. and five world powers in July is aimed at curbing Iran's nuclear program in exchange for hundreds of billions of dollars in relief for economic sanctions. (Associated Press)