A federal judge in Washington, D.C., dismissed a lawsuit filed by former Deputy National Security Adviser Charles Kupperman over a subpoena for his testimony in the impeachment inquiry, bringing to a close the one legal fight waged over a subpoena issued as part of the House’s Ukraine-focused probe.

U.S. District Judge Richard Leon on Monday granted the House’s motion to dismiss the lawsuit, filed by Kupperman’s lawyer Charles Cooper, finding that the case is moot after the House withdrew the subpoena for Kupperman’s testimony.