Former Trump campaign aide Richard Gates admitted that even while he was in discussions 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 team of prosecutors about a plea deal, he made a false statement to investigators.

Gates made the false statement during a meeting with Mueller's team on Feb. 1, the same day his previous lawyers withdrew from the case citing "irreconcilable differences," NBC News reported Friday after Gates entered his guilty plea.

A statement of offense attached to Gates's plea agreement stated that the former Trump campaign aide made a false statement about a 2013 meeting with his longtime business associate 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, Rep. Dana Rohrabacher Dana Tyrone RohrabacherDemocrat Harley Rouda advances in California House primary Lawyers to seek asylum for Assange in France: report Rohrabacher tells Yahoo he discussed pardon with Assange for proof Russia didn't hack DNC email MORE (R-Calif.) and a lobbyist, claiming that Ukrainian politics were not discussed when they were.

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Rohrabacher's spokesman Ken Grubbs issued a statement to NBC News stating that the subject of Ukraine came up "in passing" during the 2013 meeting.

"The three reminisced and talked mostly about politics. The subject of Ukraine came up in passing," Grubbs said.

"It is no secret that Manafort represented [former Ukraine president] Viktor Yanukovych’s interests, but as chairman of the relevant European subcommittee, the congressman has listened to all points of view on Ukraine. We may only speculate that Manafort needed to report back to his client that Ukraine was discussed," he added.

Gates admitted in his guilty plea to helping Manafort, 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, "in a variety of criminal schemes" centered around concealing millions of dollars earned for lobbying work in Ukraine from the U.S. government.

Manafort has maintained his innocence in the case, and issued a statement Friday expressing confusion over his business associate's guilty plea.

In a letter first reported by ABC News, Gates said Friday that he was pleading guilty for the sake of his children.

“Despite my initial desire to vigorously defend myself, I have had a change of heart,” Gates wrote. “The reality of how long this legal process will likely take, the cost, and the circus-like atmosphere of an anticipated trial are too much. I will better serve my family moving forward by exiting this process.”

Gates is now the third former Trump campaign official to plead guilty to charges stemming from Mueller's investigation into possible collusion between the Trump campaign and Russia.

Former national security adviser Michael Flynn and former Trump campaign foreign policy aide George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE both pleaded guilty last year to lying to investigators.