Former Trump campaign chairman Paul Manafort lied to the FBI and Special Counsel Robert Mueller's office "on a variety of subject matters" since his plea deal earlier this year, thereby violating the agreement, Mueller said in a court filing submitted Monday night, while adding that Manafort claims he's been truthful.

Manafort, 69, was convicted on multiple counts of financial fraud over the summer in connection to work he completed in Ukraine as a political consultant. Approaching a separate trial on similar charges in September he entered into an arrangement with the government in which he was expected to answer questions on a wide variety of matters. Manafort remains jailed and is expected to face at least 10 years in prison.

Mueller's joint status report noted that both sides called for a sentencing date to be set without delay.

“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 office said.

Manafort, however, according to the report, contested the claims of the special counsel.

"Manafort met with the government on numerous occasions and answered the government’s questions," the report said, citing the former chairman. "Manafort has provided information to the government in an effort to live up to his cooperation obligations. He believes he has provided truthful information and does not agree with the government’s characterization or that he has breached the agreement."

HOW PAUL MANAFORT IS CONNECTED TO TRUMP, RUSSIA INVESTIGATION

Still, Mueller's office argued it would "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 was convicted on 8 counts in the Eastern District of Virginia and sentencing in that case is scheduled for early February.

Fox News' Jake Gibson and The Associated Press contributed to this report.