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A U.S. Secret Service agent watches as Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, not pictured, greets supporters after speaking at a campaign event at the Orpheum Theater in Sioux City, Iowa, U.S., on Sunday, Jan. 31, 2016. Donald Trump has overtaken Ted Cruz in the final days before Iowa's caucuses, with the fate of the race closely tied to the size of Monday evening's turnout, especially among evangelical voters and those attending for the first time. Luke Sharrett/Bloomberg via Getty
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