The failed redactions reveal that Manafort "conceded" to Mueller that he discussed a "Ukraine peace plan" with associate Konstantin Kilimnik, a Russian official who Mueller has linked to a Russian intelligence agency, "on more than one occasion", and that he has been accused of lying to the government about "sharing polling data with Mr. Kilimnik related to the 2016 presidential campaign".
The information is in a filing that appears to inadvertently include details not meant to be made public and indicates a pathway by which the Russians could have had access to Trump campaign data.
The Ukraine peace plan that they discussed likely would have dealt with Russian intervention in the region.
The filing says Mueller has accused Manafort of lying to investigators about sharing the data with Konstantin Kilimnik, a business associate who was indicted past year on charges that he tampered with potential witnesses. Kilimnik, who has ties to Russian intelligence, was indicted in June.
That's according to a court filing from defense lawyers Tuesday, Jan. 8, 2019, responding to allegations that Manafort has repeatedly lied to special counsel Robert Mueller's team of investigators.
The disclosure suggests that one part of Mueller's probe is focusing on whether Kilimnik may have served as a back channel through Manafort to Russian Federation during the election.
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.
In its filing on Tuesday (local time) the defence was trying to rebut allegations Manafort intentionally lied to Mr Mueller's team after agreeing to plead guilty last September.
Defense attorneys filed a response contesting special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russian Federation probe MORE's allegations that Manafort lied to federal investigators on a variety of subjects, in breach of his plea agreement. Manafort's attorneys redacted several key parts of the filing, but appear to have made an error by allowing the redacted portions to still be read online.
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The redacted sections also disclose that Manafort and Kilimnik met in Madrid.
The special counsel's office declined to comment Tuesday.
Manafort's lawyers said he "provided complete and truthful information to the best of his ability" during multiple meetings with a grand jury and prosecutors.
The lawyers disputed any improper outreach to the Trump administration.
Manafort was viewed as a valuable witness for Mueller in his investigation into Russian interference in the election until his plea deal broke down in November as a result of the lying accusations.
The filing says that a May 26, 2018, text message exchange with Manafort involved an unidentified "third-party" who was asking permission to name-drop Manafort if the person met with Trump.
Image copyright Reuters Image caption Manafort managed the Trump campaign for five months in 2016, during the time Mr Trump clinched his party's nomination What did we learn from the documents? He's also suffering from depression and anxiety, it said.
Days before his second trial in a DC federal court was set to begin, Manafort flipped - admitting he masterminded an illegal scheme to lobby for Ukrainians and launder the revenue.
For the two charges he now faces in DC federal court, Manafort could receive 17 to 22 years in prison, his plea agreement says.