United States Senate Committee On Foreign Relations

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UNITED STATES - MARCH 11: From left, Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey, Secretary of Defense Ashton Carter, and Secretary of State John Kerry, appear before a Senate Foreign Relations Committee hearing in Dirksen Building titled "The President's Request for Authorization to Use Force Against ISIS: Military and Diplomatic Efforts," March 11, 2015. (Photo By Tom Williams/CQ Roll Call) (CQ Roll Call via AP Images)

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Senate Foreign Relations Committee Chairman Sen. Bob Corker, R-Tenn. speak to reporters on Capitol Hill in Washington, Tuesday, Feb. 10, 2015, after a closed-door security briefing on nuclear negotiations with Iran. (AP Photo/J. Scott Applewhite)

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Sen. John McCain, Arizona Republican. (AP Photo/Carolyn Kaster)

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Secretary of State John F. Kerry defends the Obama administration's response to Russia's moves on eastern Ukraine during a Senate Foreign Relations Committee hearing. (Associated Press Photographs)