Is Trump trying to provoke a constitutional crisis?.........

Good luck with that, the travel ban that Trump invoked this week, that initially included Green Card holders, was clearly intended to provoke a constitutional crisis between the Executive branch and the Judiciary. Trump along with Steve Bannon clearly believe that a popularly elected president's views should take precedence over those of the courts. Thus a ruling against the administration by the Supreme Court would simply have been ignored, thus changing the balance of power between the executive and judicial branches once and for all. If that ploy worked, the Trump administration could do whatever it wanted to from that point on with near impunity.

However, the plan could also backfire spectacularly. Many Republicans in Congress dislike Trump but like Vice President Mike Pence, a former congressman. If Trump were to ignore a Supreme Court decision, that could be an excuse for the House to IMPEACH and the Senate to CONVICT a president Republicans don't like and replace him with one they do like. And the good news here is that since nominally, the impeachment process would be about Trump flouting the Supreme Court, most of the country would support the impeachment and cheer the Republicans on. If Bannon's game plan is to get a definitive Supreme Court ruling with the intention of ignoring it to enhance the power of the executive, he is playing with FIRE.