I'll remind you that this all began with left wing cities and states deciding to thumb their noses at federal immigration laws with Sanctuary City policies.

Which they're allowed to do under the Constitution, which makes it hard to understand your reference to the Constitution earlier in the thread. We have a form of government that maintains the States as independent sovereigns, with their own authority to govern that is independent from and not delegated from the national government. Unique (I think?) among nations, our federal government was created with power delegated from the States, not vice versa.

What that means is that the States do not exist to serve the federal government's purposes, and thus cannot be "commandeered" to use their resources to enforce or promote compliance with federal law. They have to follow federal law, but they can't be forced to serve as an instrumentality of the federal government.