WASHINGTON (AP) — Former Trump campaign chairman Paul Manafort made several attempts to tamper with witnesses in his ongoing criminal case, prosecutors said as they asked a federal judge to consider jailing him while he awaits trial.

In a court filing Monday, prosecutors working for special counsel Robert Mueller wrote that Manafort and one of his associates “repeatedly” contacted two witnesses in an effort to influence their testimony. The contacts occurred earlier this year, shortly after a grand jury returned a new indictment against Manafort and while he was confined to his home. The filing marks the second time that Mueller’s team has accused Manafort of violating a judge’s order in the case. Late last year, federal agents discovered that Manafort was attempting to ghostwrite an opinion piece in Ukraine even though he was under a gag order in the case.