Either way, the President rules by decree where his party can prevent an override of his veto.
I need to go re-read Youngstown Sheet & Tube Company v. Sawyer but my understanding is that this is all "legal."
What can congress do if it does not have the power to override the vetoes. You realize it takes 2/3 to get it done. Sure we have the majority but not enough to make it easy, thanks to dingy Harry Reid and Mitch McDonnell’s failure to change the rule when he became majority leader.