Roger Stone faces charges that he lied to lawmakers, engaged in witness tampering and obstructed a congressional investigation.
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Attorney Alex van der Zwaan was also ordered to pay a $20,000 fine for lying to federal agents.
Manafort has pleaded not guilty following his arrest on charges related to conspiracy against the United States and other felonies.
Republican Devin Nunez’ decision comes as Democrats allege he’s too close to the White House to be impartial.