The moderator for the most-watched Sunday news show testified Wednesday that he didn’t reveal the name of the CIA agent to I. Lewis “Scooter” Libby, directly contradicting the former vice president chief of staff’s testimony to a grand jury.

“Meet the Press”­ moderator Tim Russert, who limped into the federal courtroom on crutches Wednesday after sustaining a broken ankle, became the third journalist to testify and the government’s star witness. Libby is on trial for perjury and obstruction of justice. No one has been charged in the leak.