Biden: 'Zero, zero, zero, zero evidence' behind Trump's Ukraine allegations

Biden: 'Zero, zero, zero, zero evidence' behind Trump's Ukraine allegations
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Former Vice President Joe BidenJoe BidenTrump surveys South Carolina supporters on preferred Democratic opponent Watch live: Trump holds a rally in South Carolina Biden, Klobuchar to address AIPAC via video MORE said on Wednesday there was "zero, zero, zero evidence" behind President TrumpDonald John TrumpTrump endorses former White House physician Ronny Jackson for Congress Newly released emails reveal officials' panic over loss of credibility after Trump's Dorian claims Lindsey Graham thanks Trump, bemoans 'never-ending bull----' at South Carolina rally  MORE's allegations regarding the 2020 candidate's behavior with Ukraine.

Trump is claiming Biden used his influence as vice president to push Ukraine to fire a senior prosecutor who at one point had investigated an energy company where Biden's son, Hunter, had served as a board member.

"There is zero, zero, zero, zero evidence of any assertion being made," Biden said at a 2020 gun safety forum in Las Vegas.

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"Look, the issue is this president of the United States engaged in something apparently that is close to, well, engaged in activity which at minimum gives a lot of running room for the Russians and Ukraine, and I think we should just focus on he's the issue," he continued. "Nobody has ever asserted that I did anything wrong except he and what’s that fella’s name? Rudy ... Giuliani. That’s it."

Trump has stepped up his attacks on Biden over the past week, releasing an ad on Friday that zeroes in on the allegations. 

Biden has said the Obama administration advocated for the prosecutor's removal because it believed he was not doing enough to combat corruption in Ukraine.

Trump and Republicans are on the defensive after Speaker Nancy PelosiNancy PelosiPelosi blasts Trump pick: He has shown 'clear disrespect' for intel community Appeals court rules House can't sue to enforce McGahn subpoena House approves bill banning flavored tobacco products MORE (D-Calif.) announced last week that the House would launch a formal impeachment inquiry amid allegations from a whistleblower that Trump sought to persuade Ukraine to investigate Biden.