A court filing says Manafort lied to the FBI and violated his plea deal

Special counsel Robert Mueller's accusation could potentially expose the former Trump campaign chairman to a longer prison sentence and more criminal charges. ABC News' Kendis Gibson reports.
2:09 | 11/27/18

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Transcript for A court filing says Manafort lied to the FBI and violated his plea deal
Let's turn out to the big new twist in the Russian investigation the special counsel Robert Mueller says former trump campaign chairman Paul metaphor. Has violated the terms of his plea deal by lying to investigators. This comes just as another key figure in the case rejects the plea deal. This morning Paul man a fort is no longer a key government witness special counsel Robert Mueller claims that matter for who pleaded guilty in September to conspiracy in connection with the investigation. Is now in breach of that plea deal a court filing says man a force president terms former campaign chairman. Committed federal crimes by lying to the FBI and the special counsel's office after he started cooperating in the rusher probe. Man referred to as accused of lying on a variety of subjects according to ABC's Pierre Thomas. The government claimed his plea remains intact but they will no longer recommend a reduction in service. Matta force attorney said he met with the government on numerous occasions. Believes that he provided truthful information still not clear what impact this will have on the investigation. But Mueller was hoping that matter fort might be able to provide. More critical details in his ongoing investigation into Russia an apparent. And some legal experts are already wondering weatherman for it is now holding out for presidential pardon meanwhile another subject of the special counsel's investigation has rejected a plea deal Jerome core C conservative writer and associate of former Trent campaign advisor Roger Stone. Says prosecutors wanted him to plead guilty to lying to FBI agent. When he was questioned about communications with Wiki leaks. Course he says he briefly forgot about an email exchange with stolen but says he did not intentionally lying and says to confessing that he did. Would be the real crime fighting. The rest in my life. I will not tell a lie to a federal judge or anybody else though a semi to prison rests in my life so be have at it but they will not get me. To commit a crime. And there's a third key figure who's not cooperating with the Muller pearl but the former term campaign advisor George Stephanopoulos. Is now serving a two week prison sentence for lying about his contact with Russians during the campaign.

This transcript has been automatically generated and may not be 100% accurate.

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