A provocative ThinkProgress piece by Ali contains this excerpt from the impending issue of Newsweek:

[Suzanne Smalley:] On torture, why should the CIA be treated differently from the armed services regarding the use of harsh interrogation tactics?

[John McCain:] Because they play a special role in the United States of America and our ability to combat terrorists. But we have made it very clear that there is nothing they can do that would violate the Geneva Conventions, the Detainee Treatment Act, which prohibits torture. We could never torture anyone, but some people misconstrue that who don't understand what the Detainee Treatment Act and the Geneva Conventions are all about.

Well, earlier in the week the presumptive Republican nominee was said to be more emphatic about the legality of warrantless wiretapping.
(The source article from the NYT also has some history about the Senator's position of several months ago, which seemed a lot more thoughtful - plus it contained this gem:)

Mr. McCain believes that "neither the administration nor the telecoms need apologize for actions that most people, except for the A.C.L.U. and trial lawyers, understand were constitutional and appropriate in the wake of the attacks on Sept. 11, 2001," Mr. Holtz-Eakin wrote.

But by Friday, the Senator himself spoke with less certainty...