Special Counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE said in a new filing Monday that Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE, President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s one-time campaign chairman, violated his plea agreement by lying to federal prosecutors.

“After signing the plea agreement, Manafort committed federal crimes by lying to the Federal Bureau of Investigation and the Special Counsel’s Office on a variety of subject matters, which constitute breaches of the agreement,” Mueller's team said in a joint status report with Paul Manafort's defense attorneys filed late Monday.

Mueller’s prosecutors asked the judge to schedule a date for sentencing.

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Manafort was convicted on eight counts of bank and tax fraud over the summer in a separate case in Northern Virginia and agreed to cooperate with Mueller in September in order to avert a second federal trial in Washington, D.C.

As part of the agreement, Manafort pleaded guilty to two felony charges related to his foreign lobbying efforts and agreed to fully cooperate with Mueller’s sprawling investigation into Russian interference in the 2016 election. He had been working with the special counsel for roughly 2 1/2 months.

Manafort, who served on Trump’s campaign for six months, was seen as a crucial witness in Mueller’s inquiry into whether anyone on the campaign colluded with Moscow.

He was one of three Trump associates who attended the June 2016 Trump Tower meeting with a Russian lawyer that was arranged by Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE, who was offered damaging information on Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE, Trump’s Democratic opponent.

However, Manafort's attorneys said in their own portion of the filing that he met with Mueller’s officials “numerous times” following his plea deal and that he believes his answers to be truthful and not constituting a breach of the agreement.

“He believes he has provided truthful information and does not agree with the government’s characterization or that he has breached the agreement,” the filing states. “Given the conflict in the parties’ positions, there is no reason to delay the sentencing herein, and he asks the Court to set a sentencing date in this matter.”

The government said it would explain in detail in a later filing ahead of sentencing Manafort’s crimes and lies, including those he told after signing the plea agreement.

The filing notes that the breach relieves the government of any obligations under the plea agreement, including promises to seek a lighter sentence for Manafort.

Manafort is one of several Trump associates ensnared in the special counsel’s investigation into Russian interference. Others who have pleaded guilty and agreed to cooperate include former Trump campaign adviser George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE, former national security adviser Michael Flynn, and Richard Gates, Manafort’s former business partner who also worked on the campaign and briefly on the presidential transition.

Papadopoulos reported to jail on Monday. Flynn is scheduled to be sentenced next month. And Gates continues to cooperate in the investigation.

Monday’s developments punctuate weeks of speculation that Mueller is nearing the final stages in his investigation. Last week, President Trump responded to written questions from the special counsel on collusion. Mueller has also sought an in-person interview with the president, though negotiations between Trump’s lawyers and the special counsel on the prospect have not yielded progress.

Manafort, who has been residing in jail, is separately scheduled to be sentenced in Virginia in February.

-Updated 7:36 p.m.