Although this article is primarily about Kerry's role, McCain is mentioned as an accomplice.
"A number of staffers became increasingly upset about Kerry's close relationship with the Department of Defense, which was supposed to be under examination. (Dick Cheney was then defense secretary.) It had become clear that Kerry, Zwenig, and others close to the chairman, such as Senator John McCain of Arizona, a dominant committee member, had gotten cozy with the officials and agencies supposedly being probed for obscuring P.O.W. information over the years. Committee hearings, for example, were being orchestrated to suit the examinees, who were receiving lists of potential questions in advance. Another internal memo from the period, by a staffer who requested anonymity, said: "Speaking for the other investigators, I can say we are sick and tired of this investigation being controlled by those we are supposedly investigating."
Mccain couldnt stand Kerry at that time. Kerrys actions back here in the states were used against Mccain when he was a pow!