Wow that’s wrong. Yes he can declassify documents. You can’t sell secrets.
See when you declassify something it no longer has value as a secret because everyone has access.
So what trump did before and plans to do now is take classified files and sell them while they are still classified.
That’s illegal. He can declassify stuff, but you have to actually say it declassified.
You can’t keep it classified and say “well I have the power to declassify things”
I have the power to drive the correct speed in the school zone. That doesn’t mean all speeds I drive are therefore legal.