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PHILADELPHIA, PA - SEPTEMBER 2:  U.S. Secretary of State John Kerry delivers a speech on the nuclear agreement with Iran at the National Constitution Center on September 2, 2015 in Philadelphia, Pennsylvania. U.S. Sen. Barbara Mikulski (D-MD) announced her support for the Iran nuclear deal, becoming the 34th Democratic senator to back the president. (Photo by Mark Makela/Getty Images)
PHILADELPHIA, PA - SEPTEMBER 2:  U.S. Secretary of State John Kerry delivers a speech on the nuclear agreement with Iran at the National Constitution Center on September 2, 2015 in Philadelphia, Pennsylvania. U.S. Sen. Barbara Mikulski (D-MD) announced her support for the Iran nuclear deal, becoming the 34th Democratic senator to back the president. (Photo by Mark Makela/Getty Images)

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Secretary of State John Kerry reveals a change in the administration's position on Syrian President Bashar al-Assad. Secretary Kerry speaks with CNN's Elise Labott.

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Secretary of State John Kerry reveals a change in the administration's position on Syrian President Bashar al-Assad. Secretary Kerry speaks with CNN's Elise Labott.