Although the filing does not say whether the polling information was public or what was done with it, it raises the possibility that Russian Federation might have used inside information from the Trump campaign as part of its effort to interfere with the election on Trump's behalf. Trump has said there was no collusion between his campaign and Moscow.
Attorneys for President Trump's former campaign chairman tried to obscure this and other revelations in a document made public Tuesday, but the text beneath the black bars could still be copied and pasted into a new document. Kilimnik, who has been charged by Mueller with obstruction of justice for allegedly tampering with witnesses in the Manafort case, has denied ties with Russian intelligence. He pleaded guilty past year to conspiracy charges in Washington and faces sentencing in a separate case in Virginia, though none of the charges are directly concerned with the alleged collusion between the Kremlin and the Trump campaign.
The special counsel said in a memo describing Manafort's alleged wrongdoing in December that Manafort's lies to federal investigators were not simply "memory lapses".
"For several months Mr. Manafort has suffered from severe gout, at times confining him to a wheelchair", the lawyers wrote.
The special counsel alleged Manafort "lied about sharing polling data with Mr. Kilimnik related to the 2016 presidential campaign", according to the unredacted filing.
I was focused yesterday on the indictment of Natalia Veselnitskaya and only considered briefly the apparently inadvertent disclosures by Paul Manafort's lawyers concerning their client's contacts with a business associate with ties to Russian intelligence.
The latest allegations further detail how Manafort's work on the campaign intersected with his past global work with Mr Kilimnik.More news: Children's Hospital Wants To Restrict Young Visitors To Keep Flu At Bay
More news: Australia: Consulates Evacuated Over Suspicious Packages
More news: Jets Interview Kliff Kingsbury For Head Coaching Job
The court filing does not reveal when that meeting took place, but an unredacted section that follows highlights that it is "not uncommon, however, for a witnesses to have only a vague recollection about events that occured years prior" and that "these occurrences happened during a period when Mr. Manafort was managing a US presidential campaign and had countless meetings, email communications, and other interactions with many different individuals, and traveled frequently".
Manafort dangled the briefings as he was mired in a dispute with Mr Deripaska over a multi-million-dollar deal involving a Ukrainian cable company.
A spokeswoman for Deripaska has said he was never offered or received briefings about the Trump campaign. Prosecutors say Manafort violated their plea agreement by lying, but his defense insists it wasn't intentional and that his mistakes were due to illness, exhaustion and extensive questioning from investigators. 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.
In August, Manafort, 69, was convicted of financial fraud relating to his work as a political consultant in Ukraine, which pre-dated his role with Donald Trump's presidential campaign. The source of that data, including whether it came from the Trump campaign, is unclear.
Prosecutors have also accused Manafort of lying about his contacts with Trump administration officials, which defense lawyers deny.
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. They say the allegations can be addressed during the presentencing process.