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UNITED STATES - JULY 23: Committee chairman Sen. Bob Corker, R-Tenn., scratches his head as he reads accusations and questions during a Senate Foreign Relations Committee hearing on Capitol Hill, in Washington, Thursday, July 23, 2015, to review the Iran nuclear agreement. Secretary of State John Kerry, Energy Secretary Ernest Moniz, and Treasury Secretary Jack Lew testified. (Photo By Al Drago/CQ Roll Call)

UNITED STATES - JULY 23: Committee chairman Sen. Bob Corker, R-Tenn., scratches his head as he reads accusations and questions during a Senate Foreign Relations Committee hearing on Capitol Hill, in Washington, Thursday, July 23, 2015, to review the Iran nuclear agreement. Secretary of State John Kerry, Energy Secretary Ernest Moniz, and Treasury Secretary Jack Lew testified. (Photo By Al Drago/CQ Roll Call)

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