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Bob Corker, a Republican from Tennessee, listens during a Senate Foreign Relations Committee hearing on Syria in Washington, D.C., U.S., on Tuesday, Sept. 3, 2013. John Kerry, U.S. secretary of state, told lawmakers that President Obama 'has no intention' of putting American troops on the ground in Syria. Photographer: Pete Marovich/Bloomberg via Getty Images

Bob Corker, a Republican from Tennessee, listens during a Senate Foreign Relations Committee hearing on Syria in Washington, D.C., U.S., on Tuesday, Sept. 3, 2013. John Kerry, U.S. secretary of state, told lawmakers that President Obama 'has no intention' of putting American troops on the ground in Syria. Photographer: Pete Marovich/Bloomberg via Getty Images