Trump says they were all declassified, so this is a bogus expedition from a legal perspective... maybe it hurts him in 2024, but the constitution and USSC have it pretty clear the president can declassify anything he/she wants, anytime, and any way... below the president there are more formal rules.. but those rules are set by the president, or his designee(s).... Obama wrote the (current) rules in 2009 on classified document handling... his order said basically the president can do whatever/whenever and no formal process is necessary...
I remember when that rule came out in 2009. Our comment then was “OMG what did that idiot just do”