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HOUSTON, TX - FEBRUARY 24:  Republican presidential candidate U.S. Sen. Marco Rubio (R-FL) speaks during a campaign rally at the Marriott South at Hobby Airport on February 24, 2016 in Houston, Texas. The process to select the next Democratic and Republican Presidential candidates continues.  (Photo by Joe Raedle/Getty Images)
HOUSTON, TX - FEBRUARY 24:  Republican presidential candidate U.S. Sen. Marco Rubio (R-FL) speaks during a campaign rally at the Marriott South at Hobby Airport on February 24, 2016 in Houston, Texas. The process to select the next Democratic and Republican Presidential candidates continues.  (Photo by Joe Raedle/Getty Images)

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Marco Rubio on insulting Trump: I'll never do it again

Sen. Marco Rubio says he was embarrassed about some his personal attacks against Donald Trump and vowed he would never do it again.

Marco Rubio on insulting Trump: I'll never do it again

Sen. Marco Rubio says he was embarrassed about some his personal attacks against Donald Trump and vowed he would never do it again.