So let's get this straight. If there’s a terrorist attack on America, the “so-called” judge who blocked Donald Trump’s travel ban will be to blame, along with the entire US “court system”.

It won’t be because demoralised security agencies struggling to adapt to unqualified new managers fail to produce accurate intelligence in exceptionally stressful circumstances.

Nor will it be down to the baseline threat level rising as a result of heightened antagonism between the new administration and the global Muslim community.

No, from this moment onwards any terrorist attack, regardless of the origin of the perpetrators, can be blamed on the justice system for failing to uphold the president’s executive order.

How convenient. What a wonderful excuse, neatly circumventing America’s division of powers, centuries of legal precedent, and the constitution itself.

By upping his criticism of Judge Robart, who suspended the travel ban, and the federal appeals court which rejected the administration’s bid to reinstate it, Donald Trump is doing far more than blowing off steam on Twitter. He’s identifying and zeroing in on yet another enemy: the judiciary.