Subject: Re: Trump on Tape w/ Classified Docs
What's the procedure for declassifying a document?

Something. The President probably can set up whatever procedure he chooses, via Executive Order - or even informally. But it would have to be something, some externally verifiable indicia that the President has actually acted. That the status of the documents that have previously been classified has now been changed - that someone has received some instruction from the President that the classification has been lifted.

For the President to have exercised a power of his office, he has to actually exercise that power. He has to do something in furtherance of exercising that power, not just think it quietly in his head but never do or say anything.

Albaby