GOP 2016 Trump(01 of42)
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)
GOP 2016 Trump(02 of42)
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)
GOP 2016 Trump(03 of42)
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)
GOP 2016 Trump(04 of42)
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)
GOP 2016 Trump(05 of42)
Open Image ModalProtestors march in Chicago on Friday, March 11, 2016, before a rally with Republican presidential candidate Donald Trump at the University of Illinois-Chicago. (AP Photo/Matt Marton) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(06 of42)
Open Image ModalProtestors march in Chicago on Friday, March 11, 2016, before a rally with Republican presidential candidate Donald Trump at the University of Illinois-Chicago. (AP Photo/Matt Marton) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(07 of42)
Open Image ModalProtestors march in Chicago on Friday, March 11, 2016, before a rally with Republican presidential candidate Donald Trump at the University of Illinois-Chicago. (AP Photo/Matt Marton) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(08 of42)
Open Image ModalProtestor Sanko Hampton displays an American flag in Chicago on Friday, March 11, 2016, before a rally with Republican presidential candidate Donald Trump at the University of Illinois-Chicago. (AP Photo/Matt Marton) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(09 of42)
Open Image ModalProtestor Sanko Hampton marches in Chicago on Friday, March 11, 2016, before a rally with Republican presidential candidate Donald Trump at the University of Illinois-Chicago. (AP Photo/Matt Marton) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(10 of42)
Open Image ModalRepublican presidential candidate Donald Trump speaks during a campaign rally Friday, March 11, 2016, in St. Louis.(AP Photo/Seth Perlman) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(11 of42)
Open Image ModalRepublican presidential candidate Donald Trump speaks during a campaign rally Friday, March 11, 2016, in St. Louis.(AP Photo/Seth Perlman) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(12 of42)
Open Image ModalTrash is scooped up, including torn campaign signs for Republican presidential candidate Donald Trump, after 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)
GOP 2016 Trump(13 of42)
Open Image ModalTrash is rounded up, including torn campaign signs for Republican presidential candidate Donald Trump, after 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)
GOP 2016 Trump(14 of42)
Open Image ModalRepublican presidential candidate Donald Trump acknowledges applauds from the crowd after speaking during a campaign rally Friday, March 11, 2016, in St. Louis.(AP Photo/Seth Perlman) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(15 of42)
Open Image ModalPolice attempt to remove protesters as Republican presidential candidate Donald Trump speaks during a campaign rally Friday, March 11, 2016, in St. Louis.(AP Photo/Seth Perlman) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(16 of42)
Open Image ModalSecurity confronts a protester, left, as Republican presidential candidate Donald Trump speaks during a campaign rally Friday, March 11, 2016, in St. Louis.(AP Photo/Seth Perlman) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(17 of42)
Open Image ModalRepublican presidential candidate Donald Trump points to balcony where protesters were causing a disturbance during a campaign rally Friday, March 11, 2016, in St. Louis.(AP Photo/Seth Perlman) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(18 of42)
Open Image ModalRepublican presidential candidate Donald Trump waves goodbye toward the balcony where protesters were causing a disturbance during a campaign rally Friday, March 11, 2016, in St. Louis.(AP Photo/Seth Perlman) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(19 of42)
Open Image ModalChicago police officers begin to clear the venue after a rally for Republican presidential candidate Donald 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)
GOP 2016 Trump(20 of42)
Open Image ModalSupporters of Republican presidential candidate Donald Trump stand quietly 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)
GOP 2016 Trump(21 of42)
Open Image ModalProtesters against Republican presidential candidate Donald Trump chant 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)
GOP 2016 Trump(22 of42)
Open Image ModalA torn campaign sign for Republican presidential candidate Donald Trump, lays on the floor after 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)
GOP 2016 Trump(23 of42)
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)
GOP 2016 Trump(24 of42)
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)
GOP 2016 Trump(25 of42)
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)
GOP 2016 Trump(26 of42)
Open Image ModalChicago police start to clear the crowd after a rally for Republican presidential candidate Donald Trump was canceled on the campus of the University of Illinois-Chicago, Friday, March 11, 2016, in Chicago. (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(27 of42)
Open Image ModalChicago police start to clear the crowd after a rally for Republican presidential candidate Donald Trump was canceled on the campus of the University of Illinois-Chicago, Friday, March 11, 2016, in Chicago. (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(28 of42)
Open Image ModalA supporter of Republican presidential candidate Donald Trump tries to pump up the crowd before it was announced the rally had been canceled on the campus of the University of Illinois-Chicago, Friday, March 11, 2016, in Chicago. . (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(29 of42)
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)
GOP 2016 Trump(30 of42)
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)
GOP 2016 Trump(31 of42)
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)
GOP 2016 Trump(32 of42)
Open Image ModalProtestors march in Chicago on Friday, March 11, 2016, before a rally with Republican presidential candidate Donald Trump at the University of Illinois-Chicago. (AP Photo/Matt Marton) (credit:ASSOCIATED PRESS)
APTOPIX GOP 2016 Trump(33 of42)
Open Image ModalFormer Republican presidential candidate Ben Carson, left, speaks with Republican presidential candidate Donald Trump after a news conference at the Mar-A-Lago Club, Friday, March 11, 2016, in Palm Beach, Fla. Carson announced he is endorsing Trump. (AP Photo/Lynne Sladky) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(34 of42)
Open Image ModalFormer Republican presidential candidate Ben Carson shakes hands with Republican presidential candidate Donald Trump, after announcing he will endorse Trump during a news conference at the Mar-A-Lago Club, Friday, March 11, 2016, in Palm Beach, Fla. (AP Photo/Lynne Sladky) (credit:ASSOCIATED PRESS)
APTOPIX GOP 2016 Debate(35 of42)
Open Image ModalRepublican presidential candidates, Sen. Marco Rubio, R-Fla., from left, Donald Trump, Sen. Ted Cruz, R-Texas, and Ohio Gov. John Kasich, stand together during the signing of the National Anthem, before the start of the Republican presidential debate sponsored by CNN, Salem Media Group and the Washington Times at the University of Miami, Thursday, March 10, 2016, in Coral Gables, Fla. (AP Photo/Wilfredo Lee) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(36 of42)
Open Image ModalRepublican presidential candidate Donald Trump speaks during a campaign rally Friday, March 11, 2016, in St. Louis. (AP Photo/Seth Perlman) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(37 of42)
Open Image ModalRepublican presidential candidate Donald Trump speaks during a campaign rally Friday, March 11, 2016, in St. Louis. (AP Photo/Seth Perlman) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(38 of42)
Open Image ModalRepublican presidential candidate Donald Trump speaks during a campaign rally Friday, March 11, 2016, in St. Louis. (AP Photo/Seth Perlman) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(39 of42)
Open Image ModalRepublican presidential candidate Donald Trump speaks during a campaign rally Friday, March 11, 2016, in St. Louis. (AP Photo/Seth Perlman) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(40 of42)
Open Image ModalRepublican presidential candidate Donald Trump speaks during a campaign rally Friday, March 11, 2016, in St. Louis. (AP Photo/Seth Perlman) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(41 of42)
Open Image ModalRepublican presidential candidate Donald Trump speaks during a campaign rally Friday, March 11, 2016, in St. Louis. (AP Photo/Seth Perlman) (credit:ASSOCIATED PRESS)
GOP 2016 Trump(42 of42)
Open Image ModalA member of Republican presidential candidate, Donald Trump's campaign staff, removes wrinkles from an American flag before a rally on the University of Illinois-Chicago campus, Friday, March 11, 2016, in Chicago. (AP Photo/Charles Rex Arbogast) (credit:ASSOCIATED PRESS)