As often as McCain must have seen intelligence documents in his years as a naval officer and/or his decades in Congress McCain should have recognized those documents were badly composed phonies. His proper response would have been to toss them into the proverbial round file next to his desk.
As one commentator I've read pointed out, these documents have been shopped around to various "news" orgs for months. They didn't report them, because they couldn't verify them - not for lack of expending considerable effort, I'm sure (maybe memories of Dan Blather and Mary Mapes helped them restrain themselves). But for all their restraint in not publishing this @#$%, the awareness of what they thought they had had to color their reportage of Trump, and not just a pastel tinge, either.
(Fixed a typo)