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MIAMI, FL - MARCH 15: Republican presidential candidate U.S. Senator Marco Rubio (R-FL), walks on stage at a primary night rally on March 15, 2016 in Miami, Florida.  Rubio announced he was suspending his campaign after losing his home state to Republican rival Donald Trump. (Photo by Angel Valentin/Getty Images)
MIAMI, FL - MARCH 15: Republican presidential candidate U.S. Senator Marco Rubio (R-FL), walks on stage at a primary night rally on March 15, 2016 in Miami, Florida.  Rubio announced he was suspending his campaign after losing his home state to Republican rival Donald Trump. (Photo by Angel Valentin/Getty Images)

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Rubio on his GOP pledge versus pledge to Florida voters

Sen. Marco Rubio talks about his reservations about Donald Trump, and whether he could support a third-party candidate.

Rubio on his GOP pledge versus pledge to Florida voters

Sen. Marco Rubio talks about his reservations about Donald Trump, and whether he could support a third-party candidate.