BUSTED: Paul Manafort was caught lying to prosecutors -- after taking their plea deal

Federal prosecutors on Monday claimed in court filings that former Trump campaign manager Paul Manafort lied to them after pleading guilty in exchange for a 10-year cap on his prison term.

In September, Manafort pleaded guilty to conspiracy against the United States and conspiracy to obstruct justice.

In the filing, the government alleged that Manafort breached his plea agreement with special counsel Robert Mueller by lying to prosecutors after signing it.

This breach, prosecutors argued, means the terms of the former campaign manager's plea deal is no longer in play.

"As the defendant has breached the plea agreement, there is no reason to delay his sentencing," the filing read.