Calm, measured, careful David Brooks, on the News Hour Friday night, said something like this (reconstructed, not quoted):
Look Trump is transparent. He has said — if you want to find my corruption go to the tex returns. And he has said to Mueller, if you got the tax returns, I will fire you. So, we know exactly what will happen. Mueller will go to the tax returns, Trmp will fire him, and we will have a constitutional crisis of some king.
I conclude that at this point we all actually know that a constitutional crisis is coming. All that remains to find out is exactly what will trigger it, how the parties align at that point and perhaps how it will end. Although I am pretty confident of the ultimate outcome.
This reminds me of my mother, who as 15 at the time of the events, saying that after Munich in 1938, everyone knew that war was coming, and that it was almost a relief when it finally did so. Then people knew what they had to do. I think it is the same now.
Now, the crisis could come from an attempted firing, it could be triggered by a refusal to comply with court or congressional orders, or less likely, it could be set off by extra-judicial illegal executive actions. Nor do we know what the triggering event will be about. It could be the now essentially admitted as to intent, Russia Collusion, the obstruction of justice claim, financial irregularities, or even the emoluments clause, to name just a few of the options.
But the outcome will depend on the willingness of the Courts and Republican politicians to enforce our constitutional norms. While it is clear that almost none of our Republican leaders have read or internalized Profiles in Courage, at some point the pain barrier will be reached.
Finally, I sometimes wonder what the definition of a constitutional crisis is? Is it when one when of the corrective measures in the constittuion cuts in and works, as it did in 1974, or is it when that mechanisms are not triggered, or fail, causing a braoder legitimacy problem. I hope we do not find out.