An attorney for 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 Wednesday demanded a retraction and apology following an MSNBC report alleging the president obtained loans from Deutsche Bank with Russian oligarchs as co-signers.

Charles Harder sent a letter to NBCUniversal saying the remarks made Tuesday night on MSNBC's "The Last Word with Lawrence O'Donnell Lawrence O'DonnellMSNBC producer pens scathing exit letter: Ratings model 'blocks diversity of thought and content' MSNBC political analyst Karine Jean-Pierre joins Biden campaign Wallace says Biden gave 'skillful' answer on advice to voters on Reade MORE" were false and defamatory, according to a copy of the letter made public by Washington Post reporter Paul Farhi.

O'Donnell walked back his reporting on Wednesday after Harder's letter was circulated.

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"Last night I made an error in judgment by reporting an item about the president’s finances that didn’t go through our rigorous verification and standards process. I shouldn’t have reported it and I was wrong to discuss it on the air. I will address the issue on my show tonight," he tweeted.

“I may have some information, in this next hour, which would add a great deal to their understanding of that, if true, and I’ll be discussing it here,” O’Donnell said. "I stress ‘if true,’ because this is a single source who has told me that Deutsche Bank obtained tax returns."

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O'Donnell, a staunch critic of the president, said later in the program that the story will "need a lot more verification before that can be a confirmable fact."

Trump , his family and his businesses. The bank did not publicly identify whose returns it had. Deutsche Bank said in a court filing Tuesday that it has tax returns relevant to House Democrats' subpoenas for financial records of, his family and his businesses. The bank did not publicly identify whose returns it had.

The name or names of the individuals or entities whose tax returns are in Deutsche Bank's possession were redacted in the version of the document posted on the federal courts' public legal database.

The White House on Wednesday condemned O'Donnell's report.

MSNBC declined to comment when it was contacted Wednesday by The Hill before O'Donnell's tweet.

The details of O'Donnell's report have not been verified by NBC News, according to a tweet by MSNBC "Morning Joe" producer Mike Del Moro on Wednesday morning.