Sen. Claire McCaskillClaire Conner McCaskillRepublicans fret over divisive candidates Greitens Senate bid creates headache for GOP The Hill's Morning Report - Biden tasks Harris on border; news conference today MORE (D-Mo.) on Wednesday said Donald TrumpDonald TrumpSt. Louis lawyer who pointed gun at Black Lives Matter protesters considering Senate run Chauvin found guilty as nation exhales US says Iran negotiations are 'positive' MORE is a “buffoon” undeserving of the presidency.

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“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 ClintonPelosi on power in DC: 'You have to seize it' Cuba readies for life without Castro Chelsea Clinton: Pics of Trump getting vaccinated would help him 'claim credit' 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 SandersNewsmax host: Jury decided to 'sacrifice' Chauvin to the mob Lawmakers react to guilty verdict in Chauvin murder trial: 'Our work is far from done' Senate confirms SEC chief Gensler to full five-year term 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.