Part of the executive power in the US is that the president influences the judicial branch, and ultimately the judicial branch is going to determine who gets to do what. They do this in many ways, a big one being they can prioritize any case they want, and simply decline to even hear certain ones. So if the president wants to do something, congress pushes back and challenges it and it goes to court, the president can effectively “get away with it” as long as the judiciary is fine with it