Former Trump campaign chairman Paul Manafort has pleaded guilty to two federal charges as part of a cooperation deal with prosecutors.

The deal requires him to cooperate "fully and truthfully" with special counsel Robert Mueller's Russia investigation.

The charges against Manafort are related to his Ukrainian consulting work - not Russian interference in the 2016 presidential election, which is the central issue in the special counsel's investigation.

Friday's move gives Mueller another successful conviction while allowing Manafort to avoid facing another costly public trial.

Manafort was convicted last month of eight financial crimes in a separate trial in Virginia.

The charges were filed in a superseding criminal information -- a formal criminal charge -- which lays out the facts of the offense and is often the precursor to the announcement of a deal. Manafort reached a deal with federal prosecutors to avoid his upcoming trial on charges related to his foreign lobbying work. 

The charges in the information say that Manafort will have to forfeit property that was derived from or traceable to his offenses. The special counsel listed some of the property that he could have to give up, including the following:

  • Brooklyn, New York apartment on Union Street
  • New York apartment on Howard Street
  • Watermill, New York property at 174 Job Lane
  • Arlington, Virginia property on Edgewood Street.
  • Funds from three bank accounts, a life insurance policy and an investment account

In response, Press Secretary Sarah Huckabee Sanders said, "This had absolutely nothing to do with the President or his victorious 2016 Presidential campaign. It is totally unrelated.”

President Trump tweeted in August that "I feel very badly for Paul Manafort" as the Justice Dept. "applied tremendous pressure on him and, unlike Michael Cohen, he refused to 'break' ... Such respect for a brave man!"

Manafort's attorney, Kevin Downing said this outside the courtroom: "A tough day for Mr. Manafort. He accepted responsibility, and he wanted to make sure that his family was able to remain safe and live a good life. He has accepted responsibility and this is for conduct that dates back many years. Everybody should remember that. Thank you everyone." 

Manafort's second trial would have been related to his Ukrainian political consulting work, including failing to register as a foreign agent. 

(The Associated Press, CBS News contributed to this report.)