There's a pretty big chance that's what's going to kick off the next Civil War.
The fact of the matter is that the Constitution in Article 4, Section 4 mandates that the federal government protect the several States from invasion — and if the President were to actively enforce this, especially militarily (which is infinitely more justifiable than war with Russia, Syria, Iran, [Insert Middle-East Country]), the courts would trip over themselves to invalidate those orders and, likely, the Congress would move to impeach… which is the height of irony: Trump's failure to repel the ongoing invasion [along with the past 20-years worth of presidents] actually is an impeachable offense, but that's the one thing where they can't impeach him otherwise it ideologically works against them and shows them to be complicit.
Even more fun is to contemplate the possibility of such officials trying to impeach him for upholding and honoring the Constitution: in the above scenario, the president would be working to end an invasion as per the Constitution, therefore an attempt to remove him for this would be both undermining/betraying the Constitution as well as providing aid and comfort to the enemies of the states. That is treason, and the Congress is not privileged from arrest for treason, and so instigating the above would be a good way to clear out politicians who are not loyal to the Constitution as their oath requires.
Where is “IKE” when we need him. Back in the 50’s “Operation Wetback” was highly successful in taking these criminals who violated our immigration laws back to where they came from. Of course that was way, way, way back when we actually enforced laws and didn’t make exceptions for groups that made a lot of noise when they were forced to obey the laws of this country. Now look at us: You choose which laws you want to obey and discard the rest. It’s “so-called” civil rights.