...if his roll in the Tillman coverup, which is disputed....
Was his role disputed? If so, then why did Stanley "The Liar" McChrystal apologize for his role?
Fact: he outright lied about the Tillman case. He admitted as such. There is no dispute regarding that.
He is a liar; he is without honor. He will lie about military actions when it pleases him. This is not like Newt's private life. Stanley "The Liar" McChrystal didn't lie about his personal life.
It would behoove you to learn the facts, and understand why your Newt analogy is invalid.