@layman,
What was Comey's response to Trump's simple request that he "investigate" the phony-ass dossier? 'It's hard to prove a negative," Comey said.
Exactly, but that's what he was apparently waiting for in the "collusion" matter--PROOF of a negative, eh?
But what it would have proved would have been Clinton's "positive" collusion with russian intelligence agents to smear Trump.
Even the chump Comey was manipulated by the Ruskies with that. He offered to pay tax-payer money for more of the same, and used it to seek FISA warrants.
I shouldn't really say "chump," I suppose. He wasn't fooled, he just wanted to use false information against Trump, just like Hillary did.
That's was what McCain was talking about, however inarticulately.