Manafort attempted to tamper with potential witnesses: U.S. special counsel.

FILE PHOTO: U.S. President Trump's former campaign manager Paul Manafort arrives for a motions hearing regarding evidence in his case at U.S. District Court in Washington, U.S., May 23, 2018. REUTERS/Yuri Gripas

WASHINGTON (Reuters) - President Donald Trump's former campaign chairman, Paul Manafort, who has been indicted by U.S. Special Counsel Robert Mueller, attempted to tamper with potential witnesses, Mueller said in a court filing on Monday.

Mueller, who is investigating possible collusion between the Trump campaign and Russia, asked the judge overseeing the case in U.S. District Court for the District of Columbia to revoke or revise an order releasing Manafort ahead of his trial.

Manafort was released to home confinement after his arraignment in October.

Mueller has indicted Manafort in federal courts in Virginia and Washington, D.C., with an array of allegations from money-laundering and failing to register as a foreign agent, to bank and tax fraud. Manafort has pleaded not guilty.

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