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UNITED STATES - September 8: Republican presidential candidate Sen. Lindsey Graham, R-S.C., answers questions during a luncheon as he strengthens his opposition against the Iran nuclear agreement at the National Press Club in Washington, Tuesday, September 8, 2015. (Photo By Al Drago/CQ Roll Call)

UNITED STATES - September 8: Republican presidential candidate Sen. Lindsey Graham, R-S.C., answers questions during a luncheon as he strengthens his opposition against the Iran nuclear agreement at the National Press Club in Washington, Tuesday, September 8, 2015. (Photo By Al Drago/CQ Roll Call)

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