The filing was made in response to special counsel Robert Mueller's claims that Manafort lied to investigators.
The filing was badly redacted, allowing an unintended glimpse at previously undisclosed areas of Mueller's investigation into whether Donald Trump's presidential campaign worked with Russian Federation to influence the election.
On Tuesday, Manafort's attorneys argued that their client did not intentionally mislead government prosecutors, describing his physical and mental well-being as severely impacted by his months of confinement in federal prison.
Lawyers say 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 hours-long interviews with little time to prepare for the questioning.
"Mr. Manafort provided complete and truthful information to the best of his ability", Manafort's lawyers wrote. Manafort's attorneys disputed the characterization that Manafort authorized the unnamed person to communicate with Trump on his behalf, according to the concealed details of the filing.
Mueller could potentially bring new charges against Manafort.
The filing says Mueller has accused Manafort of lying to investigators about sharing the data with Konstantin Kilimnik, a business associate who was indicted previous year on charges that he tampered with potential witnesses.
The US believes he is connected to Russian intelligence, but Mr Kilimnik, who is not in US custody, has denied those ties.
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The details about Manafort's alleged falsehoods come just as Russian lawyer Natalya Veselnitskaya, who famously attended a meeting with top Trump aides in 2016, was charged in a separate obstruction of justice case.
What remains unknown is whether Trump or others on the campaign were aware that Manafort provided Kilimnik and Deripaska with polling data. Manafort dangled the briefings as he was mired in a dispute with Deripaska over a multimillion-dollar deal involving a Ukrainian cable company. Mueller broke off the plea agreement November 26 telling a judge who will oversee sentencing that Manafort continued to commit crimes, which violated the arrangement. 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. Manafort allegedly shared the data while he was working on Donald Trump's Republican campaign.
"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.
The filing did not indicate whether the polling information involved internal campaign data or when exactly it was provided.
The first alleged misstatement identified in the Special Counsel's submission (regarding a text exchange on May 26, 2018) related to a text message from a third-party asking permission to use Mr. Manafort's name as an introduction in the event the third-party met the President.
Manafort has been imprisoned since June, when a federal judge said he violated his bail by reaching out to potential witnesses in his case.
Court watchers and the judge anticipated that the Manafort team would either push back on Mueller's team's assertions-like they previously indicated they would-or agree not to fight the special counsel as Manafort headed to sentencing.