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HOUSTON, TX - FEBRUARY 25:  Republican presidential candidates  Florida Sen. Marco Rubio (R-FL), Donald Trump, and Texas Sen. Ted Cruz (R-TX) stand on stage for the Republican National Committee Presidential Primary Debate at the University of Houston's Moores School of Music Opera House on February 25, 2016 in Houston, Texas. The candidates are meeting for the last  Republican debate before the Super Tuesday primaries on March 1.  (Photo by Joe Raedle/Getty Images)
HOUSTON, TX - FEBRUARY 25:  Republican presidential candidates  Florida Sen. Marco Rubio (R-FL), Donald Trump, and Texas Sen. Ted Cruz (R-TX) stand on stage for the Republican National Committee Presidential Primary Debate at the University of Houston's Moores School of Music Opera House on February 25, 2016 in Houston, Texas. The candidates are meeting for the last  Republican debate before the Super Tuesday primaries on March 1.  (Photo by Joe Raedle/Getty Images)

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