Paul Manafort repeatedly lied to federal investigators about topics including his contact with the Trump administration and his interactions with a Russian associate accused of helping him tamper with witnesses, special counsel prosecutors said Friday, detailing for the first time their allegations the former Trump campaign chairman breached his plea agreement.

In court papers filed Friday evening, prosecutors said Manafort told “multiple discernible lies” that could not be considered “mere memory lapses.” Prosecutors appeared to welcome the opportunity to prove that Manafort lied after agreeing to cooperate with the special counsel probe.