Well, maybe Canada is pretty unlikely I concede. But it seems possible that it might be some other first world nation that has friendly relations with America.

Well, maybe Canada is pretty unlikely I concede. But it seems possible that it might be some other first world nation that has friendly relations with America. I mean, America spied on Germany, right? Maybe Germany spies on America. I really haven't the foggiest clue who did it, but I wouldn't limit consideration to overtly adversarial countries.