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It's no secret that Mitt Romney is not a Donald Trump supporter, but now he's upping his anti-Trump rhetoric.

In an interview with Wolf Blitzer, Romney claimed that a Trump presidency would be "extraordinarily dangerous to the heart and character of America," reiterating that he will not be voting for the presumptive Republican nominee.

“I simply can’t put my name down as someone who voted for principles that suggest racism or xenophobia, misogyny, bigotry, [for someone] who’s been vulgar time and time again,” Romney told Blitzer. “I don’t want to be associated with that in any way, shape or form.”

"Trickle-down racism, trickle-down bigotry, trickle-down misogyny, all these things are extraordinarily dangerous to the heart and character of America."

Trump took to Twitter this morning to respond to Romney's comments.

Mitt Romney had his chance to beat a failed president but he choked like a dog. Now he calls me racist-but I am least racist person there is — Donald J. Trump (@realDonaldTrump) June 11, 2016

On "Fox and Friends Weekend" today, Herman Cain said Romney should halt his attacks on Trump and focus on uniting the splintered Republican Party.

"He is not helping the situation. He is hurting the situation," Cain said. "If you really want to help this nation, Mitt, shut up."

Watch the "Fox and Friends Weekend" co-hosts react above and see more from Cain below.

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