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US Secretary of State John Kerry (C) waits prior to world powers representatives meeting to pin down a nuclear deal with Iran, on March 30, 2015 at the Beau Rivage Palace Hotel in Lausanne. AFP PHOTO POOL/BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images
US Secretary of State John Kerry (C) waits prior to world powers representatives meeting to pin down a nuclear deal with Iran, on March 30, 2015 at the Beau Rivage Palace Hotel in Lausanne. AFP PHOTO POOL/BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images

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    Will U.S. use military force on Iran?

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Will U.S. use military force on Iran?

The U.S. has not ruled out using military force to prevent Iran from going nuclear. CNN's Barbara Starr has more.

Will U.S. use military force on Iran?

The U.S. has not ruled out using military force to prevent Iran from going nuclear. CNN's Barbara Starr has more.