Trump knocks Biden: He was only a good VP because he would 'kiss Barack Obama's ass'

President TrumpDonald John TrumpTrump faces high stakes in meeting with Erdoğan amid impeachment drama Democrats worry they don't have right candidate to beat Trump Trump threatening to fire Mulvaney: report MORE blasted former Vice President Joe BidenJoe BidenDemocrats worry they don't have right candidate to beat Trump Trump threatening to fire Mulvaney: report Giuliani pens op-ed slamming 'unprecedented' impeachment inquiry MORE on Thursday at a campaign rally in Minneapolis over his legacy as vice president and affection for former President Obama.

During his rally, Trump accused Biden of only being viewed favorably because Biden "understood how to kiss Barack ObamaBarack Hussein ObamaSaagar Enjeti rips Buttigieg for praising Obama after misquote Steyer scores endorsement from key New Hampshire activist Saagar Enjeti dismisses Warren, Klobuchar claims of sexism MORE's ass," a charge that was met with loud cheers and scattered boos for the Democratic presidential contender.

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"He was never considered smart. He was never considered a good senator," Trump added of Biden, while also taking aim at Hunter Biden, the vice president's son whom the president has accused Biden of using his office to help.

Biden slammed Trump's remarks later in the evening after attending aLGBT forum hosted by CNN and the Human Rights Campaign (HRC).

"I spent my night at the HRC forum talking about the fundamental respect every human being deserves. You spent yours showing how little respect for anyone else you have. America is so much stronger than your weakness, @realDonaldTrump," Biden tweeted.

Earlier in his address at the rally, Trump also touched on the allegations of Biden's efforts to oust a Ukrainian prosecutor while serving as vice president in 2016.

Trump has said the move was due to the prosecutor's investigation of Burisma, a company on which Hunter Biden served as a board member, though no evidence has emerged that Biden was acting with his son's interests in mind.

"It's not unsubstantiated, it's fact," Trump argued Thursday night.

The president's attempts to spur investigations by foreign nations including Ukraine into Biden has become the center of an impeachment inquiry in the House, which the White House has refused to cooperate with and labeled an attempt by Democrats to overturn the 2016 election.

Updated: Oct. 11 at 12:46 a.m.