Ex-FBI counterintelligence chief Charles McGonigal faces sentencing for working with Russian...

One of the highest-ranking FBI agents to ever face criminal charges is scheduled to be sentenced on Thursday.

Charles McGonigal, a former counterintelligence leader in the FBI's New York field office, pleaded guilty to a conspiracy charge and has asked for no prison time.

The former FBI counterintelligence chief in New York deserves five years in prison, federal prosecutors said in a sentencing memorandum after accusing him of abusing the skills and influence his country entrusted him with by secretly working for a sanctioned Russian oligarch.

He served as the special agent in charge of the Counterintelligence Division of the FBI's New York field office. In that position, McGonigal supervised and participated in investigations of Russian oligarchs, including Oleg Deripaska, to whom he provided impermissible services.