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"I think Elizabeth Warren is very smart, and anybody who's listened to him and how he's talked certainly could draw that conclusion," Clinton said.

"I'm going to let people judge for themselves, but I have the highest regard for Sen. Warren."

Clinton repeatedly slammed Trump as a “loose cannon,” calling him too dangerous to be president.

"I've seen the presidency up close from two different perspectives, and I think I know what it takes," she said.

"I don't think we can take a risk on a loose cannon like Donald Trump running our country."

Clinton pointed to Trump's suggestions that more countries should have nuclear weapons and that wages are too high in America, as well as his pledge to ban Muslims from entering the U.S. and his changing position on abortion.

"He's the one who ran a campaign insulting people, demeaning women, degrading people with disabilities, talking about keeping Muslims out of the country," she said.

The interview with CNN was Clinton's first public appearance since Trump became the presumptive GOP presidential nominee.