Former White House Press Secretary Ari Fleischer testified on Monday in the perjury and obstruction trial of Scooter Libby, Vice President Dick Cheney’s former chief of staff. Fleischer said Libby divulged Valerie Plame’s identity to him on July 7, 2003, three days earlier than Libby has told investigators he first learned of the undercover CIA officer. Newsweek’s Michael Isikoff described Fleischer’s testimony as the most significant in the case to date. Fleischer is the fifth witness to contradict Libby’s version of events. The former New York Times reporter Judith Miller is scheduled to testify today. Cathie Martin finished up her testimony on Monday. She was Dick Cheney’s former top press assistant. She is married to Kevin Martin, the chair of the Federal Communications Commission.