Lawyers for a New York Times reporter tangled up in a fight with federal prosecutors urged the U.S. Supreme Court on Monday to undo an appeals court ruling that would force his testimony in a CIA leak prosecution.

A divided U.S. Court of Appeals for the Fourth Circuit in July overturned a trial judge’s ruling that would have allowed James Risen to keep secret the source of information in his book about the George W. Bush administration and intelligence agencies. Risen’s book, “State of War: The Secret History of the CIA and the Bush Administration,” included details about the National Security Agency’s warrantless wiretapping program.