" the judiciary has recently made decisions usurping executive authority." Here's the definition of "usurp"...seize, take over, take possession of, take, commandeer, wrest, assume, expropriate "  The word conveys the taking of authority and assumption of such.  This, of course, is NOT what the courts have done.  The Courts, as, of course, one of the three branches of our government, exercised their legal authority to "check" the executive power of the President.  Since Marbury v. Madison, that has been one of the Court's recognized and confirmed powers.  When you have an "over-reaching" executive branch such Court action is predictable.    

Let's also be clear.. President Trump has openly declared the media to be the "enemy of the American people."  We know that authoritarian government and dispotic leaders control the media as tightly as possible.  IMO, Mr. Trump realizes he wouldn't be able to openly censor the media, so he's working very hard to delegitimate it.