Peace activists discuss a letter written by Senator Tom Cotton, R-AR, outside of his office in the Russell Senate Office Building on Capitol Hill in Washington, DC on March 19, 2015. The freshman senator was the author of a letter to Iran's leaders which warned the Iranian regime that Congress could undo any nuclear deal reached with the Obama administration. AFP PHOTO/MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
