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WASHINGTON (Reuters) - President Donald Trump’s former campaign chairman Paul Manafort pleaded not guilty on Friday to new witness tampering charges brought by the special counsel investigating Russia’s role in the 2016 U.S. presidential election.

Manafort appeared at an arraignment before U.S. District Judge Amy Berman Jackson in Washington on the new charges brought by Special Counsel Robert Mueller last week. Jackson on Friday was also weighing whether to revoke Manafort’s current bail conditions and send him to jail because of the fresh allegations against him.