So does the Associated Press it seems, as per the exchange during the press conference.

But yes, I would probably want some form of intelligence briefing being declassified in paper form before pointing the finger at a nuclear adversary. That ol' extraordinary claims require extraordinary evidence thing.

Or do you think that some spy in Russia, telephoned a guy in the pentagon, that telephoned a guy in the whitehouse, that setup a press conference and then telephoned a guy to brief him about something he should say, that may or may not help to provoke a war?

Seems a bit far fetched.

No, the reporter explicity said, "It's not the format, it's the content." They were looking for evidence, they didn't care whether it was written or not.