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 met with 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 office Monday as a routine part of his cooperation in the Russia probe, according to a report from Politico.

The news outlet spotted two of Manafort's attorneys, Richard Westling and Tom Zehnle, outside Mueller's office conferring with one of Mueller's lead prosecutors, Andrew Weissmann.

The men left to get unch and then reconvened with their food in the secure building that headquarters Mueller's team, according to Politico.

Spokesmen for both Manafort and Mueller declined to comment to Politico.

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Manafort pleaded guilty to two federal charges earlier this month, agreeing to cooperate with Mueller in his investigation into alleged collusion between Russia and the Trump 2016 campaign.

The charges included money laundering and illegal lobbying for a Ukrainian group that's friendly with Russia.

Critics have said Manafort's testimony could be damaging for 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, while his defenders say the Manafort's conviction is unrelated to the president.

"This had absolutely nothing to do with the President or his victorious 2016 Presidential campaign," White House press secretary Sarah Huckabee Sanders said. "It is totally unrelated."

Sentencing for Manafort is not expected to take place until after the midterms.