Special counsel Robert Mueller’s prosecutors filed evidence late Friday afternoon to demonstrate that Paul Manafort violated a court-mandated gag order by contributing to an op-ed defending himself in a Ukrainian newspaper.

In a 41-page filing, prosecutors argue that Manafort, who is on trial for charges including money laundering and failing to file as a foreign agent, spent half an hour editing a column defending him written by former Ukrainian official Oleg Voloshyn.