Lawyers for Paul Manafort apparently mistakenly filed a court document Tuesday that revealed redacted material- including accusations Manafort shared 2016 campaign polling data with a Russian national linked to the Kremlin.
Manafort's lawyers argue in the filings he did not break his plea deal because he did not lie intentionally.
The lawyers for Donald Trump's former campaign chairman were given a midnight deadline by the judge to file the documents.
The Associated Press also reported Tuesday that a new court filing in the case indicates Manafort lied about sharing polling data on the 2016 presidential race with Kilimnik, an associate accused of having ties to Russian intelligence. Sections of the filing were meant to be redacted, but the text underneath several blacked-out lines could be copied and viewed.
"The defense contests the Government's conclusion and contends that any alleged misstatements, to the extent they occurred at all, were not intentional", Manafort's lawyers said in the filing, which was filed on Monday and released by the court on Tuesday.
Mueller claimed in a November 26 filing that Manafort breached his plea deal and "committed federal crimes by lying to the Federal Bureau of Investigation and the special counsel's office on a variety of subject matters".
Manafort reached the plea agreement with Mueller in September after a jury found him guilty of eight charges of tax evasion and bank fraud by a jury in the USA state of Virginia in August.
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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.
They also said Manafort was awakened before dawn on the days he was interviewed and normally spent the entire day talking with investigators.
He led the Trump campaign during the Republican convention when, United States intelligence officials say, Russian Federation was working to sway the election in Mr Trump's favour.
"Issues and communications related to Ukrainian political events simply were not at the time forefront of Mr. Manafort's mind during the period at issue and it is not surprising at all that Manafort was unable to recall specific details prior to having his recollection refreshed", they said. While the redactions don't specifically mention the Trump campaign by name, they do mention the "2016 presidential campaign".
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.
The request to use Manafort as an introduction to Mr Trump came while Manafort was under indictment in two federal cases. But in December Mueller's team asked the court to schedule sentencing, saying Manafort had violated that deal by lying to investigators.
In the filing Manafort's lawyers said they would not seek an evidentiary hearing to contest Mueller's allegations of lying, arguing that such factual matters could be addressed in a pre-sentencing report.