B$. It might trigger a call from the loonies on the left for impeachment, but there will be no impeachment.
If a president defied a court order, it would lead to contempt of court charges, impeachment, and a full-blown Constitutional crisis. If you think Congressional Republicans will back Trump against a federal court, you’re badly mistaken. Trump will deal with it intelligently, by writing a new EO that will stand up to legal challenge, and he’ll continue to pursue an appeal on the original EO (the ruling by the 9th was nonsense). He will not break the law.