Biden: 'I guarantee' Trump will challenge legitimacy of election if GOP loses

Former Vice President Joe BidenJoe BidenNew York Times editorial board calls for Trump's impeachment Graham invites Giuliani to testify about recent Ukraine trip Booker leads other 2020 Dems in petition urging DNC to change debate qualifications MORE said Tuesday that he would be "dumbfounded" if Democrats failed to retake the majority in the House, and expressed certainty that President TrumpDonald John TrumpRepublicans aim to avoid war with White House over impeachment strategy New York Times editorial board calls for Trump's impeachment Trump rips Michigan Rep. Dingell after Fox News appearance: 'Really pathetic!' MORE would question the legitimacy of the results if Republicans falter in Tuesday's midterm elections.

"I guarantee he’ll challenge the legitimacy of the vote," Biden said with a laugh when asked about the possibility after casting his ballot in Delaware.

"You know, he’s still looking for that million crowd that was there for his inauguration, for God’s sake," Biden continued. "He’s an interesting guy."

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Biden spoke with reporters after he voted on Tuesday.

Democrats need to pick up 23 House seats to retake control of the chamber, and Republicans are hoping to maintain or pad their two-seat majority in the Senate.

President Trump has, in recent days, warned of the specter of voter fraud, despite experts' widely held conclusion that illegal voting does not occur on a large scale.

Following the 2016 election, the president claimed that he lost the popular vote to Hillary ClintonHillary Diane Rodham ClintonNo, the polls aren't wrong — but you have to know what to look for How to shut down fake Republican outrage over 'spying' on Trump More than 200,000 Wisconsin voters will be removed from the rolls MORE because of millions of illegal votes. Though he did not provide proof for his claim, he formed a controversial voting commission to look into the matter. That body was disbanded in January after numerous states declined to hand over voter information.

Trump has traveled across the country over the past week to bolster GOP candidates running against incumbent Democrats in states he won in 2016. The president's closing message has focused largely on immigration, stoking fear about a caravan of Central American migrants traveling north to the U.S. and painting a dystopian picture of America under a Democrat-led Congress.

Biden, who is considered a potential 2020 Democratic presidential candidate, said Monday that the midterm elections were about "choosing hope over fear" and "truth over falsehood."

"This is pretty basic stuff," he said.

Biden hypothesized that a number of Republicans who narrowly win reelection this year or who are up for reelection in 2020 will begin to distance themselves from Trump's style.

"I think you’re gonna see them distancing themselves ... in terms of this harsh rhetoric and his divisive politics," Biden said.