Former Trump campaign manager 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 discussed his business dealings in Ukraine with an associate thought to have ties to Russian intelligence as recently as 2018, according to court documents filed in the ongoing special counsel investigation.

In filings obtained by The Washington Post detailing court proceedings concerning whether Manafort lied to investigators and violated his plea deal, prosecutors reveal that Manafort discussed political work in Russia with a business associate in the "winter of 2018," months after his initial indictment for a number of financial crimes related to his lobbying for pro-Russian political groups.

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The associate, Konstantin Kilimnik, was indicted under Mueller's investigation last year for obstruction of justice and is believed to be the unnamed figure in other court filings in the special counsel investigation referring to a person with close ties or membership in Russian intelligence.

The filings also reportedly reveal for the first time that Kilimnik attended Trump's inauguration in some form, though it was unclear from the Post's report whether the president was aware of the Russian businessman's presence.

Manafort is accused by Mueller's prosecutors of lying to the special counsel investigation on multiple occasions, which the Post reports in at least one instance prosecutors believe was "to at least augment his chances for a pardon."

President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE refused to rule out the possibility of pardoning his former campaign chairman late last year, telling The New York Post that “[i]t was never discussed, but I wouldn’t take it off the table. Why would I take it off the table?”

Manafort is set to be sentenced by Judge Amy Berman Jackson next month.