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> Federal law trumps state law.

Constitution trumps Federal law.

Tenth Amendment:

> The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.

The Feds are welcome to enforce immigration law. They cannot require California to participate. https://constitution.congress.gov/browse/essay/amdt10-4-2/AL...

> Federal law trumps state law.

This is absolutely not true in general, and the constitution explicitly circumscribes the jurisdiction of federal law.