The office of special counsel Robert Mueller has said in a new filing that there’s “probable cause” to believe former Trump campaign chairman Paul Manafort attempted to tamper with potential witnesses.

“The evidence set forth below and in the attached declaration of Federal Bureau of Investigation (FBI) Special Agent Brock W. Domin establishes probable cause to believe that Manafort has violated 18 U.S.C. § 1512(b)(1) by attempting to tamper with potential witnesses while on pretrial release and, accordingly, has violated the conditions of his release,” according to the document.