Sen. Claire McCaskillClaire Conner McCaskillHow Citizens United altered America's political landscape #MidnightMoscowMitch trends amid criticism of McConnell's proposed impeachment trial rules The most expensive congressional races of the last decade MORE (D-Mo.) on Wednesday said Donald TrumpDonald John TrumpMnuchin knocks Greta Thunberg's activism: Study economics and then 'come back' to us The Hill's Morning Report - House prosecutes Trump as 'lawless,' 'corrupt' What to watch for on Day 3 of Senate impeachment trial MORE is a “buffoon” undeserving of the presidency.

ADVERTISEMENT

“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 This Morning.”

McCaskill said Hillary ClintonHillary Diane Rodham ClintonCollins walks impeachment tightrope Hill.TV's Saagar Enjeti rips Sanders for 'inability to actually fight with bad actors' in party Hill.TV's Krystal Ball knocks Clinton's 'mean girl' comments against Sanders MORE should focus on substance while the presumptive GOP nominee wrestles with the fallout from his off-the-cuff remarks.

“I think there will be a battle between those who are trying to script Donald Trump and the real Donald Trump,” she said. "There couldn’t be a bigger gulf between how people how people view the issues between Hillary Clinton and Donald Trump.

“I have to believe America will come together — as [Clinton] said last night, break down barriers and unite and not focus on the ridiculous notion that Mexico is going to build a wall.”

McCaskill added that rival Bernie SandersBernie SandersThe Hill's Morning Report - House prosecutes Trump as 'lawless,' 'corrupt' Tensions between McConnell and Schumer run high as trial gains momentum Sanders wants one-on-one fight with Biden MORE would ultimately help Clinton unite the Democratic Party against Trump.

“I think we need to give time,” she said of Sanders. "I think over the next couple of weeks this will all come together.

“I know he cares deeply about making sure that Donald Trump’s finger is never near the button,” said McCaskill, who has previously endorsed Clinton, referring to the U.S. nuclear arsenal.

Clinton on Monday crossed the 2,382-delegate threshold necessary for securing the Democratic presidential nomination, according to The Associated Press.

Trump trails Clinton by 2 points nationwide in the latest RealClearPolitics average of polls.