The 10th amendment says that "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".
If you argue that a federal law violates the U.S. constitution ... it is a matter that is settled in federal court and ultimately, the SC. So the 10th amendment is not applicable.
That statement pretty well backs up what i just said. Powers not delegated to the united states by the constitution nor prohibited by the states.
Bypassing proper legislation and implementation of laws largely controversial and in violation of the second amendment and opposed by the states seems to be pretty well covered that they have no authority to do so.
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