Special counsel Robert S. Mueller III said in a court filing Monday that former Trump campaign chairman Paul Manafort violated his plea deal by lying to members of his office and the FBI. 

The plea agreement Manafort entered in September required him to “fully, truthfully, completely, and forthrightly” cooperate with the government, Mueller said in a joint status report with Manafort’s lawyers filed Monday in the U.S. District Court for the District of Columbia.

“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 said. “The government will file a detailed sentencing submission to the Probation Department and the Court in advance of sentencing that sets forth the nature of the defendant’s crimes and lies, including those after signing the plea agreement herein.”

Manafort’s lawyers said their client “believes he has provided truthful information and does not agree with the government’s characterization or that he has breached the agreement.”

Attorneys for both sides said they see no reason to delay Manafort’s sentencing given the government’s decision that the plea deal was violated and requested the court set a date for that and a schedule for any pre-sentencing submissions and motions.

In August, Manafort, a key player in Mueller’s Russia investigation, was found guilty of eight counts of tax evasion and bank fraud by a federal jury in Virginia. He then entered a plea deal the following month, agreeing to “cooperate fully, truthfully, completely, and forthrightly” with Mueller’s team and other law enforcement officials.

Flashback: What I Saw That You Couldn’t See at the Manafort Trial, Week 2