Democratic Sen. Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE laid into Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE during an interview with Missouri radio host McGraw Milhaven, calling him a “buffoon” and questioning the voters who have been supporting him.

“I wonder how many people that are voting for him that are kind of embarrassed,” the Missouri senator said on KTRS Thursday morning, first reported by BuzzFeed. “I have so many friends that are — I feel for them. A lot of Republican friends are just saying, ‘We can’t let this guy be commander in chief. He has no idea what he’s talking about.’ ”

ADVERTISEMENT

McCaskill slammed Trump’s shaky policies and questioned whether he was fit to be president.

“This is a guy who changes his mind like he changes his shirt on matters of great consequence to this country, and I don’t think he even wants to grasp some of the complexities that he would be forced to deal with as president of the United States.”

McCaskill, who supports Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE, said she acknowledged that “all the candidates aren’t perfect” but “they never are.”

"At the end of the day, this is a buffoon,” she said about Trump.

Milhaven asked McCaskill about Clinton’s low favorability rating and why many voters will admit Trump is "the worst guy in the world, they’ll say, he’s dangerous, he shouldn’t be commander in chief, but I can’t vote for [Clinton]."

McCaskill blamed it on the presumptive Democratic nominee’s “decades of public service.”

"She represents the status quo, because of her name and the fact that she’s been in the public eye for so long,” she explained. “And so many people want to blow up the status quo."

McCaskill has previously called Trump a buffoon.

“This is about whether or not we’re going to put into the Oval Office someone who is vulgar and who makes frequent racist comments, who makes it up as he goes along, and who is risky and reckless with what he says, who has been a buffoon in many instances and would be a buffoon on the world stage,” she said on CBS earlier this month.