This is an embarrassment.
Even if you completely agree with what the order does, it's impossible to claim that the implementation of this was anything other than a complete and utter disaster. No warning, no clear way to enforce the order, widespread protest, and getting the courts involved within 24 hours.
This is going to have ramifications for years to come. We want to encourage the world's best and brightest to come here, and a precedent of unannounced, widespread, severe changes to enforcement of the laws will cause people to reconsider.
This is utter negligence and I'm ashamed of my country.