Even here you run into the Constitutional issue since he is their boss and at least theoretically is the source of the authority of all the rules they operate under other than legislation that explicitly binds a president's actions, and even in these cases the SCOTUS may find for a president if he challenges it.
e.g. the Mar-a-Lago case wouldn't exist if Trump could have shown he declassified the docs before he took them because he had the authority to do it.
It's a powerful office, the Founders never imagined it had to made idiot proof.