Did he do it or didn't he? I have no idea but I am more concerned over what information is now going to be withheld by the international intelligence community, the rest of the 'five eyes'.
Can't you just imagine the scene;
"Gee Mr President we have hard evidence of a dirty device in London, England. We think they're going to detonate it on New Year's Eve. We should really tell those guys in MI5."
"How did we get this Intel?" asks America's first female president.
"From our special source" comes the answer.
"No way am I endangering our source on those stupid, untrustworthy limeys, ever, period. Now get uncle Vladimir on the phone."