Federal prosecutors convinced a jury in August 2018 to convict Manafort on eight of 18 bank and tax fraud charges in a trial in NY.
Former Trump campaign manager Paul Manafort arrives for arraignment on a third superseding indictment against him by Special Counsel Robert Mueller on charges of witness tampering, at US District Court in Washington, US June 15, 2018.
At the time, Manafort's team said they did not have enough information from the government about their client's alleged lies to reply.
The defense lawyers said Manafort suffers from depression and anxiety, has had little contact with his family and, on days when he met with investigators, was awakened before dawn to have hourslong interviews with little time to prepare for the questioning.
"These circumstances weighed heavily on Mr. Manafort's state of mind and on his memory as he was questioned at length", the lawyers wrote.
The documents reveal that Manafort lied about sharing polling data for the 2016 presidential election with Kilimnik, and about meeting with the Russian in Madrid, during the campaign.
Lawyers working for President Donald Trump's former campaign chairman Paul Manafort have accidentally revealed the clearest evidence of coordination between the campaign and Russians, the media reported on Wednesday.
Mueller had previously accused Manafort of lying about his interactions with Kilimnik, a Russian national who used to run the offshoot of Manafort's consulting business in Ukraine. This includes his connection with former business partner Konstanin Kilimnik, a Ukrainian accused by prosecutors of having ties to Russian intelligence.More news: Captain Marvel: New trailer, posters revealed
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The Mueller prosecutors, who for 20 months have been investigating Trump campaign links to Russian Federation and whether Trump, as president, tried to illegally obstruct the probe, contended that Manafort lied about least five subjects. Manafort has also forfeited tens of millions of dollars in property.
Through his spokesman, Manafort has acknowledged discussing the briefings, but said they never occurred.
But on Tuesday, Manafort's team sought to rebut those accusations point by point.
The filing also showed that Mueller accused Manafort of discussing a "Ukraine peace plan" with Kilimnik and meeting with him in Madrid at some point during the 2016 campaign. The US and European Union have imposed sanctions on Russian Federation over that move as well as the country's support for separatist rebels in eastern Ukraine.
"It is not surprising at all that Mr. Manafort was unable to recall specific details prior to having his recollection refreshed", according to one portion of the filing that was blacked out. It is unclear whether the polling data was related to the briefings for Deripaska. In other words, it's possible that this is a window into Trump campaign collusion, but it's also possible that it's just Manafort personally trying to, as he put it, "get whole" with Deripaska-something we already knew he was doing aggressively.
In Tuesday's filing, Manafort's attorneys said that person was "asking permission to use Mr. Manafort's name as an introduction in the event the third-party met the President", which "does not constitute outreach by Mr. Manafort to the President".
For the two charges he now faces in DC federal court, Manafort could receive 17 to 22 years in prison, his plea agreement says.
A jury in Alexandria, Va., convicted Manafort on charges of bank and tax fraud in August, after which he agreed to plead guilty to two separate charges and cooperate with Mueller's investigation.