Manafort faces sentencing in a separate case next Wednesday in Washington on two conspiracy charges to which he pleaded guilty last September.

While he faces a statutory maximum of 10 years in the Washington case, US District Judge Amy Berman Jackson potentially could stack that on top of the sentence imposed in the Virginia case, rather than allowing the sentences to run concurrently.

Manafort is the only one of the 34 people and three companies charged by Mueller to have gone to trial. Several others including former campaign aides Rick Gates and George Papadopoulos, former national security adviser Michael Flynn and former Trump personal lawyer Michael Cohen have pleaded guilty, while longtime Trump adviser Roger Stone has pleaded not guilty.

Gates, a key witness against Manafort, has yet to be sentenced due to his ongoing cooperation with prosecutors.

Trump, who has called Mueller's investigation a politically motivated "witch hunt," has not ruled out granting a presidential pardon to Manafort, saying in November that "I wouldn’t take it off the table."