Biden dismisses Trump's Ukraine allegations: 'The president should start to be president'

Democratic presidential candidate Joe BidenJoe BidenHouse clears bill to provide veterans with cost-of-living adjustment On The Money — Dems dare GOP to vote for shutdown, default To reduce poverty, stop burdening the poor: What Joe Manchin gets wrong about the child tax credit MORE dismissed President TrumpDonald TrumpTrump takes shot at new GOP candidate in Ohio over Cleveland nickname GOP political operatives indicted over illegal campaign contribution from Russian national in 2016 On The Money — Dems dare GOP to vote for shutdown, default MORE’s call for an investigation into the former vice president's ties to Ukraine amid conservatives’ accusations of misconduct.

“Not one single, credible outlet has given any credibility to his assertion. Not one single one,” Biden told reporters Friday. “So I have no comment except the president should start to be president.”

The comment comes after reports emerged Friday that Trump pressured Ukrainian President Volodymyr Zelensky during a phone call in July to work with Rudy GiulianiRudy GiulianiRoger Stone served with Capitol riot lawsuit during radio interview FEC finds Twitter didn't break law by blocking spread of Hunter Biden story Juan Williams: The toxic legacy of Trump's corruption MORE, his personal attorney, to investigate Biden’s son, Hunter.

Trump did not deny the reports on Friday, telling reporters, “it doesn’t matter what I discuss.” 

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“But I will say this: Somebody ought to look into Joe Biden's statement, because it was disgraceful,” he added.

Trump and other Republicans have sought to cast Biden as corrupt over his efforts as vice president in 2016 to push Ukraine to dismiss a top prosecutor.

The prosecutor was investigating a natural gas company owned by a Ukrainian oligarch, and Hunter Biden sat on the company's board.

No evidence has emerged to suggest Biden acted with his son’s interests in mind, but Trump’s allies, including Giuliani, have said the former vice president should still be investigated.

The prosecutor eventually resigned amid corruption allegations.

Giuliani at first denied and then acknowledged that he had asked Ukraine to look into allegations against Joe Biden while appearing for an interview on CNN Thursday night.

Trump weighed in on the topic Friday amid mounting scrutiny over a whistleblower complaint from someone in the intelligence community that reportedly details a troubling "promise" he made to a foreign leader.

The New York Times reported Friday evening that Trump's desire for an investigation into Biden was part of the whistleblower complaint, while the Times and Washington Post have said the whistleblower’s claims specifically centered around Ukraine.

Joseph Maguire, the acting intelligence chief, is scheduled to testify publicly before Congress next week over the complaint. Trump is also slated to meet with Zelensky on the sidelines of the United Nations General Assembly next week, a senior administration official told reporters earlier Friday.