If he issued such an EO after taking office and without prior notice, I think we could see a shattering of our federal system.
If you understand that risk and think it necessary when compared to the killing of the unborn, I can respect that position.
Just remember that in 1860 and 1861, there were many fire eaters on both sides who thought that after a brief period of saber rattling, their opponents would give in. They were wrong.
I see zero probably in a constitutional crisis arising under those circumstances.
After all, the courts use the Constitution as a threadbare dishrag every day to suit their purposes, and we sit idly by.
Why should anyone revolt when the executive branch finally stands its ground?
The Supreme Court is the one standing on tenuous ground here. And they know it.