Secretary of State John Kerry looks on as Secretary of Defense Ash Carter testifies before the Senate Armed Services Committee on behalf of the Iranian nuclear deal recently brokered by the Obama administration in Washington, July 29, 2015. Carter and Kerry were joined by Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey, U.S. Treasury Secretary Jack Lew and Energy Secretary Ernest Moniz. (DoD Photo by Glenn Fawcett /Released)