Three U.S. Supreme Court justices on Wednesday praised deputy U.S. solicitor general Michael Dreeben just hours after his 100th appearance before the court—a tough argument in which the court gave Dreeben an unusually hard time.

“He’s made these 100 arguments—fabulous—and he’s remained sane,” said Justice Stephen Breyer at a reception marking the milestone at Georgetown University Law Center, hosted by its Supreme Court Institute and dean William Treanor.