Attorneys for President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE’s former campaign chairman Paul Manafort Paul John ManafortBannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention Ukraine language in GOP platform underscores Trump tensions MORE last night filed under seal responses to 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’s accusations that Manafort breached a plea agreement by lying to federal prosecutors, a Manafort spokesman tells The Hill.

As of early Tuesday morning, it appeared that they had possibly missed a court-ordered deadline to reply to the claims.

A filing responding to the claims was due Monday, but the midnight deadline came and went without any submission appearing on the court’s docket. The Manafort spokesman says that the document was filed under seal. Attorneys normally announce their intention to file under seal and it was not reflected in the document.

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Mueller in November accused Manafort of lying to the FBI and the special counsel’s office on a variety of subject matters, including Manafort's contacts with Trump administration officials; his interactions with an associate who has suspected ties to Russian intelligence; the associate's role in tampering with witnesses; a $125,000 payment made to a firm working for Manafort; and information he provided related to another Justice Department investigation.

In a court hearing in December, Manafort’s attorneys had said they may not contest Mueller’s claims, which they had initially denied.

Prosecutors on Mueller’s team at the time told Judge Amy Berman Jackson, an Obama appointee overseeing Manafort’s case in the federal District Court for the District of Columbia, that they were considering bringing new charges against Manafort for the crimes he committed by breaching the deal.

Berman Jackson has scheduled March 5 as a tentative date to sentence Manafort to the two felonies he pleaded guilty to as part of the plea agreement, which allowed him to avoid a second criminal trial in return for his full cooperation in the Mueller’s Russia investigation.

Monday’s filing is the latest flashpoint in Manafort’s case and comes well over a year after Mueller first charged him with a series of offenses related to his lobbying on behalf of a pro-Russia political party in Ukraine.

A jury in Alexandria, Va., convicted Manafort of eight counts of bank and tax fraud over the summer.

Manafort was viewed as a key witness for Mueller as he investigates Russian interference in the 2016 presidential election and possible collusion between the Trump campaign and the Kremlin, but Manafort's cooperation with the probe was short-lived.