Former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE addressed the impeachment inquiry into President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE on Sunday, quipping to an audience that he was "the only reason" that it was happening.

"I may be the last guy that publicly called for impeachment, but I'm the only reason there is impeachment going on," he said at the United Food and Commercial Workers union presidential forum Sunday. He was referring to the fact that the impeachment inquiry was launched after a whistleblower report sounded alarm over President Trump's urging for Ukraine to investigate Biden and his son, Hunter.

Biden told the forum's crowd that the American public should care about impeachment because "democracy is literally at stake."

.@JoeBiden says even though he was the last Dem candidate to call for impeachment “I’m the only reason why there is impeachment...” @CBSNews (via @ellee_watson) pic.twitter.com/lgnyp1d6Dd — Bo Erickson (@BoKnowsNews) October 13, 2019

He added that "whether or not the Senate will impeach, there's no option" for the House other than considering impeachment, saying it was not because the whistleblower report mentioned him.

"Their job is to determine whether to impeach," he said. "My job is to flat out beat him."

Biden told the crowd that he thinks the American public will pay more attention if the House votes to impeach Trump and potentially change its representatives' opinions.

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"What's going to change Republicans' minds in the United States Congress is when their constituents start changing their minds," Biden said. "And you're seeing it start to happen."

Polls released last week showed that slightly more than the majority of Americans support impeachment and removing Trump from office, following his interactions with Ukraine.

Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) launched an impeachment inquiry a whistleblower report said Trump asked the Ukrainian president to "look into" Biden and his son, Hunter.

Trump requested information on the Biden family after the former vice president pushed to have a Ukrainian prosecutor removed, who was looking into the Ukrainian company, of which his son at on the board.

Biden directly called for Trump's impeachment for the first time last week.