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PENSACOLA, FL- MARCH 12: U.S. Republican presidential candidate Sen. Marco Rubio (R-FL) speaks to supporters at the Palafox Wharf on March 12, 2016 in Pensacola, Florida. On the eve of the Florida primary, Rubio finds himself trailing in third place. (Photo by Mark Wallheiser/Getty Images)
PENSACOLA, FL- MARCH 12: U.S. Republican presidential candidate Sen. Marco Rubio (R-FL) speaks to supporters at the Palafox Wharf on March 12, 2016 in Pensacola, Florida. On the eve of the Florida primary, Rubio finds himself trailing in third place. (Photo by Mark Wallheiser/Getty Images)

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Rubio stands by Trump concerns, will honor RNC pledge

Sen. Marco Rubio joins Jake Tapper for his first TV interview since dropping out of the presidential race in March.

Rubio stands by Trump concerns, will honor RNC pledge

Sen. Marco Rubio joins Jake Tapper for his first TV interview since dropping out of the presidential race in March.