Republican presidential candidate, Donald Trump, left, listens as Republican presidential candidate, Sen. Ted Cruz, R-Texas, answers a question during the Republican Presidential Primary Debate at the University of Houston Thursday, Feb. 25, 2016, in Houston. (AP Photo/Houston Chronicle, Gary Coronado, Pool)
Republican presidential candidate, Donald Trump, left, listens as Republican presidential candidate, Sen. Ted Cruz, R-Texas, answers a question during the Republican Presidential Primary Debate at the University of Houston Thursday, Feb. 25, 2016, in Houston. (AP Photo/Houston Chronicle, Gary Coronado, Pool) Gary Coronado AP
Republican presidential candidate, Donald Trump, left, listens as Republican presidential candidate, Sen. Ted Cruz, R-Texas, answers a question during the Republican Presidential Primary Debate at the University of Houston Thursday, Feb. 25, 2016, in Houston. (AP Photo/Houston Chronicle, Gary Coronado, Pool) Gary Coronado AP