CHICAGO, IL - MARCH 11: Police break up skirmishes between demonstrators and supporters of Republican presidential candidate Donald Trump that broke out after it was announced a rally at the University of Illinois at Chicago would be postponed on March 11, 2016 in Chicago, Illinois. The campaign decided to postpone the rally, citing safety concerns, after learning hundreds of demonstrators were given tickets for the event. (Photo by Scott Olson/Getty Images)
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