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DES MOINES, IA - FEBRUARY 01: Republican presidential candidate Donald Trump speaks at his Iowa Caucus night gathering February 1, 2016 in Des Moines, Iowa. Sen. Ted Cruz (R-TX) has won the Iowa Republican Caucus. (Photo by Scott Olson/Getty Images)

DES MOINES, IA - FEBRUARY 01:  Republican presidential candidate Donald Trump speaks at his Iowa Caucus night gathering February 1, 2016 in Des Moines, Iowa.   Sen. Ted Cruz (R-TX) has won the Iowa Republican Caucus.  (Photo by Scott Olson/Getty Images)