"Enacting" some anti-gun EO would only prove his arrogance and, in my mind, be reason for impeachment, though I'd have to research that just to make sure it would even qualify. He could "clarify" specific rulings for the EPA, CDC, ATF, etc. to adhere to that isn't expressly explained by law. Such as, material bullets are made of like require them to be biodegradable(?). Or perhaps push for the courts to hand down very strict sentencing for a very small violation of gun law, despite a person doing something by accident or without ill-intent. I can't think of other examples right now. Forgive me if my understanding is off.