During the primaries: Then-Republican presidential candidate, Sen. Marco Rubio, R-Fla., left, and Republican presidential candidate, businessman Donald Trump both speak during a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston.
During the primaries: Then-Republican presidential candidate, Sen. Marco Rubio, R-Fla., left, and Republican presidential candidate, businessman Donald Trump both speak during a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. DAVID J. PHILLIP AP File
During the primaries: Then-Republican presidential candidate, Sen. Marco Rubio, R-Fla., left, and Republican presidential candidate, businessman Donald Trump both speak during a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. DAVID J. PHILLIP AP File