I think it's a reasonable theory (regardless of how they apply it inconsistently). The President doesn't have universal power to do whatever, Congress should au

I think it's a reasonable theory (regardless of how they apply it inconsistently). The President doesn't have universal power to do whatever, Congress should authorize specific actions that the President can do, and if those go beyond a reasonable amount of flexibility they would need to authorize that separately. Say you hire someone to paint your house and then go on vacation and when you come back they replaced your roof as well and gave you a $30,000 bill. You would be legitimately angry that they didn't authorize this extra work with you first even if they argue it was related to painting because the roof interfered with the paint.