Former Trump campaign chairman Paul Manafort lied to the Federal Bureau of Investigation 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.
Both the special counsel and Mr Manafort's attorneys agreed there was no reason to delay sentencing and asked the court to set a date for it.
But with prosecutors saying he breached the agreement, Manafort now faces serious repercussions such as the possibility of prosecution on additional charges, including those prosecutors dropped when he made the deal.
Mueller's team did not spell out what Manafort lied about.
They did not elaborate on what Manafort lied about.
Manafort pleaded guilty on September 14 days before trial in Washington, DC, to two charges - conspiring to defraud the United States and conspiring to obstruct justice - admitting to years of financial crimes related to his undisclosed lobbying work for a pro-Russian political party and politician in Ukraine.
Mueller continued on to recommend that Manafort be sentenced for the crimes that he admitted to in the plea deal. He was ordered to forfeit an estimated US$15 million he hid from the Internal Revenue Service, but permitted to keep some property held with family members.
The latest development could indicate a set back for Mueller's investigation if Manafort had not been cooperating.
Prosecutors say in a new court filing that after Manafort agreed to truthfully cooperate with the investigation, he "committed federal crimes" by lying about "a variety of subject matters".
They do argue this leaves Manafort exposed to the possibility of a more severe prison sentence under federal guidelines. "Manafort met with the government on numerous occasions and answered the government's questions".
"Manafort has provided information to the government in an effort to live up to his cooperation obligations", it said.