Special counsel Robert Mueller’s office submitted a highly redacted filing Wednesday to the U.S. District Court in D.C. to say prosecutors recently learned new information pertinent to a federal judge’s ruling against former Trump campaign chairman Paul Manafort for lying to investigators.

The memo mentions that Rick Gates, a former business associate to Manafort who is cooperating with Mueller’s team, was interviewed by Mueller’s office on Feb. 15 and offered new details related to the ruling that Manafort intentionally lied about his contacts with Konstantin Kilimnik, a Russian employee of Manafort’s political consulting firm who the FBI claims has ties to Russian intelligence.