U.S. Secretary of State John F. Kerry gestures as he speaks to the media about the deal that six world powers and Iran have reached calling for Tehran to limit its nuclear activities in return for sanctions relief, at the International Conference Center of Geneva on Sunday, Nov. 24, 2013, in Geneva, Switzerland. (AP Photo/Carolyn Kaster, Pool)

Photo by: Carolyn Kaster

U.S. Secretary of State John F. Kerry gestures as he speaks to the media about the deal that six world powers and Iran have reached calling for Tehran to limit its nuclear activities in return for sanctions relief, at the International Conference Center of Geneva on Sunday, Nov. 24, 2013, in Geneva, Switzerland. (AP Photo/Carolyn Kaster, Pool)