(01 of11)
Open Image ModalProtesters against Republican presidential candidate Donald Trump shout at Trump supporters after it was announced that the candidate's rally was canceled due to security concerns, on the campus of the University of Illinois-Chicago, Friday, March 11, 2016, in Chicago. (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)
(02 of11)
Open Image ModalProtesters against Republican presidential candidate Donald Trump chant 'Bernie, Bernie, and We Stopped Trump,' after a rally on the campus of the University of Illinois-Chicago, was canceled Friday, March 11, 2016, in Chicago. (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)
(03 of11)
Open Image ModalProtesters against Republican presidential candidate Donald Trump chant Bernie, Bernie, and We Stopped Trump, after a rally on the campus of the University of Illinois-Chicago, was canceled Friday, March 11, 2016, in Chicago. (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)
(04 of11)
Open Image ModalSupporters of Republican presidential candidate Donald Trump, left, face off with protesters after a rally on the campus of the University of Illinois-Chicago was cancelled due to security concerns Friday, March 11, 2016, in Chicago. (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)
(05 of11)
Open Image ModalSupporters of Republican presidential candidate Donald Trump, left, face off with protesters after a rally on the campus of the University of Illinois-Chicago was cancelled due to security concerns Friday, March 11, 2016, in Chicago. (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)
(06 of11)
Open Image ModalA supporter of Republican presidential candidate Donald Trump tries to pump up the crowd before a rally on the campus of the University of Illinois-Chicago, Friday, March 11, 2016, in Chicago. The rally was canceled. (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)
(07 of11)
Open Image ModalProtesters against Republican presidential candidate Donald Trump celebrate after it was announced that a rally for Trump was canceled due to security concerns on the campus of the University of Illinois-Chicago, Friday, March 11, 2016, in Chicago. (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)
(08 of11)
Open Image ModalProtesters of Republican presidential candidate Donald Trump, right, chant after a rally on the campus of the University of Illinois-Chicago, was canceled due to security concerns Friday, March 11, 2016, in Chicago. (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)
(09 of11)
Open Image ModalAttendees watch as protesters are removed before a rally for Republican presidential candidate Donald Trump on the campus of the University of Illinois-Chicago, Friday, March 11, 2016, in Chicago. (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)
(10 of11)
Open Image ModalA protester holds up a ripped campaign sign for Republican presidential candidate Donald Trump before a rally on the campus of the University of Illinois-Chicago, Friday, March 11, 2016, in Chicago. (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)
(11 of11)
Open Image ModalA protester raises his fist to supporters of Republican presidential candidate Donald Trump before a rally on the campus of the University of Illinois-Chicago, Friday, March 11, 2016, in Chicago. (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)