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 on Wednesday said that he learned from the impeachment hearings on Capitol Hill that 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 and Russian President Vladimir Putin Vladimir Vladimirovich PutinWatchdog confirms State Dept. canceled award for journalist who criticized Trump Former intelligence agency director Robert Cardillo speaks out against 'erratic' Trump Kremlin: Putin calls for reset between US and Russia on cyber relations before elections MORE do not want him to be the Democratic presidential nominee.

"I've learned something from these impeachment trials — I've learned that Donald Trump doesn't want me to be the nominee," Biden told the audience at the fifth Democratic presidential debate in Atlanta.

"Vladimir Putin doesn’t want me to be president," he added.

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The former vice president continued to push his electability argument, saying that he is the candidate with the best chance of beating Trump one-on-one.

A number of polls have shown Biden defeating Trump in a head-to-head match-up in key battleground states.

Biden's comments follow the second day of public testimony this week in the ongoing impeachment inquiry into Trump's dealings with Ukraine.

Wednesday saw bombshell testimony from U.S. Ambassador to the European Union Gordon Sondland Gordon SondlandGOP chairman vows to protect whistleblowers following Vindman retirement over 'bullying' Top Democrat slams Trump's new EU envoy: Not 'a political donor's part-time job' Trump names new EU envoy, filling post left vacant by impeachment witness Sondland MORE, who confirmed that Trump pressured Ukrainian leaders to investigate Biden and his son Hunter Biden, by dangling a meeting and a phone call with the country's new president.

Sondland also said that Trump's personal attorney, Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE, told U.S. officials in Ukraine that he wanted a public statement from Ukrainian President Volodymyr Zelensky “committing to investigations of Burisma and the 2016 election.”