Kerry Warns Congress on Iran: 'This Is a Choice Between a Diplomatic Solution and War'

US Secretary of State John Kerry walks delivers a statement on Cuba outside the hotel where the Iran nuclear talks meetings are being held in Vienna, Austria, July 1, 2015.

CHRISTIAN BRUNA/AFP/Getty Images

Secretary of State John Kerry is warning lawmakers before his Senate testimony next week that a vote against the Iran deal may leave the U.S. largely helpless to curb that nation’s nuclear program.

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