My point was that he could look at everything, if he knew to ask for it. But it just isn't in his character to do that. He would have to read a lot of very long boring documents and follow a complex document trail, and few of the important ones even mention his name!
Theoretically, he could launch a nuclear attack on Iran too, but at some point the people around him are going to stop him. When he does something insane, everyone (but maybe Bolton) will agree it's Amendment 25 time and lock him in a rubber room.
Still, there are things he CAN'T do, and he found out another one today: He can't fire the Fed chief. He can't control the House or Senate, unless they let him. He can't make Mexico pay for the wall. He can't fire a Supreme Court Justice, or even tell them what to do.