The alleged main source for British ex-spy Christopher Steele’s discredited anti-Trump dossier was arrested on Thursday as part of special counsel John Durham’s criminal inquiry into the origins and conduct of the Trump-Russia investigation.

Igor Danchenko, a Russian-born lawyer who lives in the Washington, D.C., area, was taken into custody by federal law enforcement after being hit with charges in a newly-unsealed indictment obtained by Durham’s office.