Former-Judge Luttig wrote a guest essay in the New York Times, titled "It's Trump vs. the Courts, and It Won't End Well for Trump." The essay concludes with these two paragraphs:
If the president oversteps his authority in his dispute with Judge Boasberg, the Supreme Court will step in and assert its undisputed constitutional power "to say what the law is." A rebuke from the nation's highest court in his wished-for war with the nation's federal courts could well cripple Mr. Trump's presidency and tarnish his legacy.
And Chief Justice Marshall's assertion that it is the duty of the courts to say what the law is will be the last word.
I think every sentence is demonstrably incorrect. First, the Court has no power to "assert" its own authority. The Court lacks the power of the sword or purse.