Former Vice President Joe Biden said Tuesday that he'll made a decision about his political future at the beginning of next year.

He signaled after casting his vote in Wilmington that he's ready to take on Donald Trump if he opts in to what's likely to be a crowded 2020 field.

The retired U.S. senator took several jabs at the sitting president over repeated complaints about alleged voter fraud as he participated in an impromptu news conference.

Biden told NBC News, 'I guarantee he’ll challenge the legitimacy of the vote. He’s still looking for that million crowd that was there for his inauguration, for God’s sake.'

Former Vice President Joe Biden said Tuesday that he'll made a decision about his political future at the beginning of his year. He signaled after casting his vote in Wilmington that he's ready to take on Donald Trump, though, if he opts in to what's likely to be a crowded 2020 field

Run-down from promoting Democrats across the country at a presidential-level clip, Biden's voice cracked as he spoke to reporters on Election Day from his polling place in Delaware.

He told press parked in a hallway as it poured on the East Coast that he still doesn't know whether he'll seek the presidency in 2020 and will soon make an internal assessment.

'I have to make my decision about what I'm going to do after the first of the year. It will be a family decision,' he said.

Pressed on a timeline for a formal announcement, Biden said: 'I wouldn’t announce, even if I were going to run, that early. It would be too early to get started.'

The 75-year-old Democrat who hails from Scranton, Pennsylvania, said his possible candidacy would depend entirely on the circumstances, including announcements from his potential competitors.

Biden has kept as aggressive of a campaign schedule as Trump in the final days of he 2018 election and said Tuesday it was because he was 'requested' by candidates to make appearances for them in what he deemed the 'single most important off-year election in my lifetime.'

'I think it's about the character of the country,' he said, echoing his comments on the stump, as he added, 'I really believe it. I think we have to change the tone.'

The longtime senator who served for two terms as vice president to Barack Obama said, 'The politicking has gotten too nasty, and it's too base, and this appeal to nativism and nationalism, and the phony nationalism, and racism has, has got to stop. And I think election is gonna put some breaks on it.'

'I'll be dumbfounded if we lose the House. I'll be surprised if we don't win by a comfortable margin,' he asserted.

Democrats are poised to pick up dozens of seats in the House of Representatives in today's elections. The Senate map is more murky.

He signaled after casting his vote in Wilmington that he's ready to take on Donald Trump, though, if he opts in to what's likely to be a crowded field

Biden predicted that as a result of what's expected to be a Republican bloodbath, there will be a realignment of views within the president's party.

Republicans up for reelection in 2020 will learn hard lessons from their colleagues on the ballot this year, he said. 'I think you're gonna see them distancing themselves like a number of them did from Trump in terms of his harsh rhetoric and his divisive politics.'

A caravan of migrants has taken center stage in Trump's election-year message, but warnings about illegal voting that he routinely made in 2016 also crept back into rhetoric this week.

'Law Enforcement has been strongly notified to watch closely for any ILLEGAL VOTING which may take place in Tuesday’s Election (or Early Voting),' he said in a Monday tweet. 'Anyone caught will be subject to the Maximum Criminal Penalties allowed by law. Thank you!'

The claim echoed his 2016 complaints that Hillary Clinton was rigging the popular vote in her favor.

'Serious voter fraud in Virginia, New Hampshire and California - so why isn't the media reporting on this? Serious bias - big problem!' he tweeted after the last election.

At a rally last night in Missouri, conservative radio host Rush Limbaugh again promoted the theory that Democrats and Clinton had rigged the popular vote to make Trump lose two years ago.

'Hillary Clinton colluded with Russia. Hillary Clinton rigged that election,' the guest of Trump's contended.

Asked on Tuesday about the likelihood that Trump would accept the outcome of the vote this time if Republicans lose, Biden laughed and took a dig at the sitting Republican's inauguration crowd.

Trump infamously sent then-White House press secretary Sean Spicer out on his first full day in office to insist it was the most-attended inauguration in American history.

'He’s still looking for that million crowd that was there for his inauguration, for God’s sake,' Biden said with a laugh. 'He’s an interesting guy.'

He took a more somber tone a moment later as he reflected on today's vote, saying, 'This is all about choosing hope over fear. This is about choosing our friends over our enemies overseas. This is about choosing truth over falsehood. I mean it really is.

'This is pretty basic stuff, so thank you so much,' he said.