The newly hired lawyers for former Trump campaign adviser George Papadopoulos on Friday began their push to erase his prosecution and conviction, arguing in a court filing in Washington that the special counsel is serving unlawfully.

Papadopoulos, a foreign policy adviser on the Trump campaign, pleaded guilty to lying to federal agents and was sentenced in September to 14 days in prison. That term is set to begin Nov. 26. His lawyers at Pierce Bainbridge Beck Price & Hecht want the incarceration put on hold pending the outcome of a case in the U.S. Court of Appeals for the D.C. Circuit.