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Is Marco Rubio sorry he went ‘there’ with Donald Trump? ‘No,’ candidate says

04:28

Florida Senator Marco Rubio stepped up his effort to take down GOP front-runner Donald Trump during Thursday night’s rowdy Fox News debate. The presidential hopeful joins TODAY’s Savannah Guthrie to discuss his effort to blunt Trump’s run, as well as the pledge by 2012 GOP candidate Mitt Romney to do everything within “normal political bounds” to stop Donald Trump. “There is a significant percentage of people in our party who will never vote for him,” Rubio says, referring to Trump.