Sam Patten, a Washington lobbyist and political consultant, was charged Friday with failing to register as a foreign agent related to his consulting work for a Ukrainian political party, marking the latest enforcement action flowing from the special counsel’s scrutiny of advocacy for international clients.

Patten, reportedly formerly associated with Paul Manafort, the onetime Trump campaign chairman, was set to appear Friday in U.S. District Court for the District of Columbia. Federal prosecutors in Washington, under the leadership of U.S. Attorney Jessie Liu, filed a one-count information against Patten accusing him of failing to register under the Foreign Agent Registration Act.