Let me take a passing shot at that.
Doesn't that stand for the proposition that a state can take no action and is defenseless vis-a-vis losses, even above and beyond its monetary losses, when the federal government chooses not to resist foreign invaders?
Perhaps it is not believed they are invaders?
No, it merely stands for the proposition that the Constitution means what it says, when it states in Article VI that,
This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.
In short, that means that states cannot are not allowed to creat their own laws to supercede what the Constitution or Congress have already passed into law.
States are not totally "defenseless," because they can (and do) take cases to court against the Federal Government. Costs and damages imposed on the States by the Federal Government's failure to properly address illegal immigration, is something that can be, should be, and is being, challenged in the courts.