"Schiltz’s “strong rebuke” relied on the anti-commandeering principle, which “means that the federal government cannot command the states or their officers to take any action to effectuate federal policy,” Litman’s wrote.
The 10th amendment reads:
“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.”
https://constitution.congress.gov/constitution/amendment-10/
This amendment has also been discussed in terms of secession.