John Kerry

John Kerry

U.S. Secretary of State John Kerry speaking to the media after closed-door nuclear talks on Iran take place in Vienna, Austria, Tuesday, July 15, 2014. (AP Photo/Ronald Zak)

U.S. Secretary of State John Kerry speaking to the media after closed-door nuclear talks on Iran take place in Vienna, Austria, Tuesday, July 15, 2014. (AP Photo/Ronald Zak)

Iranian nukes: Gaps remain, but talks continue