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UNITED STATES - JULY 23: From left, Sen. John Barrasso, R-Wyo., Sen. Jeff Flake, R-Ariz., Committee chairman Sen. Bob Corker, R-Tenn., and Sen. Ron Johnson, R-Wis., speak before the Senate Foreign Relations Committee hearing on the Iran Nuclear Agreement on Thursday, July 23, 2015. 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: From left, Sen. John Barrasso, R-Wyo., Sen. Jeff Flake, R-Ariz., Committee chairman Sen. Bob Corker, R-Tenn., and Sen. Ron Johnson, R-Wis., speak before the Senate Foreign Relations Committee hearing on the Iran Nuclear Agreement on Thursday, July 23, 2015. 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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