Sen. Rand Paul, Kentucky Republican, listens as Secretary of State John F. Kerry answers Mr. Paul's question on Capitol Hill in Washington on Tuesday, Sept. 3, 2013, as Mr. Kerry testifies at a Senate Foreign Relations Committee hearing on Syria. (AP Photo/Jacquelyn Martin)

Sen. Rand Paul, Kentucky Republican, listens as Secretary of State John F. Kerry answers Mr. Paul's question on Capitol Hill in Washington on Tuesday, Sept. 3, 2013, as Mr. Kerry testifies at a Senate Foreign Relations Committee hearing on Syria. (AP Photo/Jacquelyn Martin)