And this Chief Executive was elected by the majority of the country, specifically to take these actions that he'd clearly stated he would take.
The resistance is actually the violation of federal law. It's no different from contempt of court; within the President's domain, he has a huge amount of power. The President can also modify existing policy (regulations) at any time and literally make new laws (Executive Orders have the force of law) as long as they don't conflict with current law, as well as overturning previous President's Executive Orders.
Of course, then the shoe will be on the other food someday, too, just as it was when Biden took over from Trump and then they switched places again.
As President Obama said, "I've got a pen, and I've got a phone."
https://www.npr.org/2014/01/20/263766043/wielding-a-pen-and-...