A one-page memo from the lawyers of President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's former 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, suggests that federal investigators could have had an informant inside of Manafort's consulting firm, according to Politico.

The document, which reportedly appears to have been accidentally submitted in court, says a reporter seemed to have obtained access to internal information from Davis Manafort Partners International.

It was apparently prepared by someone working to support a claim of improper contact between prosecutors and the media, Politico reported.

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"In the Winter of 2017 (sic 2016) employee of DMI—CS-1 permitted the reporter to view material on a hard drive copy of DMI's electronic files," the document reads. "Government obtained warrant for the hard drive."

The document does not identify the journalist, but cites an Associated Press report that mentions a receipt of payment to Manafort discovered by anti-corruption investigators in Ukraine.

Manafort was charged with conspiracy against the United States, tax fraud and money laundering as part of 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 investigation into Russian election meddling, including possible collusion between the Trump campaign and Moscow.

The indictment, which included charges against Manafort's business partner, Richard Gates, was the first in Mueller's federal probe.