Former Trump campaign chairman Paul Manafort and his longtime business partner Rick Gates have been charged in a 12-count indictment with conspiracy against the United States, conspiracy to launder money and making false statements.

It marked the first criminal allegations to come from Special Counsel Robert S. Mueller III’s investigation into possible coordination between the Trump campaign and Russia to influence the 2016 election.

Gates did not respond to a request for comment, nor did Jason Maloni, a spokesman for Manafort. Manafort was spotted walking into the FBI’s Washington Field Office Monday morning.