In both instances they're the result of the Constitution being so old and sacrosanct that you can no longer amend it in a meaningful way. You simply change the norms, stack the courts, and you've knocked out the leg of the stool that was supposed to uphold these ideals. A modern president moving around money allocated by Congress flies in the face of the Constitution. Same with an immigration ban based on religion. But the game has changed to "us v them", and if you get enough of your team in the judiciary they'll sign off whatever you want.