Federal investigators on special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's team have reportedly interviewed President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's longtime friend and former inauguration committee chairman, Tom Barrack.

Sources familiar with the investigation told The Associated Press that Barrack has met with investigators working on the probe into Russian meddling in the election.

Barrack, who has been close with Trump for at least 30 years, has been one of the president's top confidants and worked on fundraising for his presidential inauguration.

The interview reportedly included questions regarding two close friends of Barrack's — former Trump campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE and his business associate Richard Gates, both of whom were previously indicted as part of Mueller's probe.

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While the former Trump associates have both been charged with money laundering and conspiracy against the U.S., only Gates has pleaded guilty and has agreed to cooperate with Mueller's investigation.

Mueller is seeking a sit-down with the president himself, a proposal currently being discussed between Mueller's team and Trump's attorneys.

Trump said Friday that he would "love to speak" with Mueller to clear his name in the probe he has repeatedly called a "witch hunt," but cited his legal team's reluctance for an in-person interview. The team is reportedly in a "final push" to decide whether to allow the interview.

Possible questions for such an interview that were leaked earlier this month suggest a focus by Mueller on possible obstruction of justice in the investigation.

— Updated at 2 p.m.