Sen. Claire McCaskillClaire Conner McCaskillMcCaskill: Lindsey Graham 'has lost his mind' Trey Gowdy joins Fox News as a contributor The Hill’s 12:30 Report: Trump AG pick Barr grilled at hearing | Judge rules against census citizenship question | McConnell blocks second House bill to reopen government MORE (D-Mo.) on Wednesday said Donald TrumpDonald John TrumpTrump nominates ambassador to Turkey Trump heads to Mar-a-Lago after signing bill to avert shutdown CNN, MSNBC to air ad turned down by Fox over Nazi imagery 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 ClintonOvernight Defense: Trump declares border emergency | .6B in military construction funds to be used for wall | Trump believes Obama would have started war with North Korea | Pentagon delivers aid for Venezuelan migrants Sarah Sanders says she was interviewed by Mueller's office Trump: I believe Obama would have gone to war with North Korea 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 SandersBernard (Bernie) SandersNewsom endorses Kamala Harris for president Business, conservative groups slam Trump’s national emergency declaration Poll: Sanders, Biden seen as most popular second choices in Dem primary 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.