Apart from whether there is any evidence that such an order actually existed, the notion has been greeted with disdain by national security legal specialists. Glenn S. Gerstell, the top lawyer for the National Security Agency from 2015 to 2020, pronounced the idea that whatever Mr. Trump happened to take upstairs each evening automatically became declassified — without logging what it was and notifying the agencies that used that information — “preposterous.”…

“Hypothetical questions like ‘What if a president thinks to himself that something is declassified? Does that change its status?’ are so speculative that their practical meaning is negligible,” said Steven Aftergood, a secrecy specialist with the Federation of American Scientists.

He added: “It’s a logical mess. The system is not meant to be deployed in such an arbitrary fashion.”