The memo and all the FISA information came from the executive branch. He can release it anytime he wants. In fact, as the Special Council digs into the Russian/NRA (business man) connections for anything... anything and soon to drag brain-dead Bannon in, now is the time to shut Mueller down.
Of course, if Trump doesn't hold fast to border wall/ending chain migration/ending VISA lottery and delayed voting on illegals, then much of this becomes moot. We will lose the midterms and Trump is in jeopardy anyway.
The memo is a summary written by the committee. More specifically, by the Republican leadership of the House Committee on Intelligence.
The other thing that people miss is that this memo is not in the hands of anyone. It is kept in the Intelligence Committee room and the members are allowed to go read it. No pens,no paper, no phones...
So, unless someone has a photographic memory, having any one person leak it is not going to happen either.
So, the Pres does not have the authority to declassify anything but the information provided by the FISA court and the other intelligence gathering agencies. THAT is not going to happen.
The House has to vote to release this. Not the Senate. Not the President.
So, if there is anything in bad about long time members of Congress, this will never be released. As I said on another post, they will never vote to cut their own throats.
Its a nice thought...but the revolution is going to have to come from the outside—because the people inside only think of themselves.