Superfluous, but excellent.
The Arizona House passed a law to nullify federal gun control measures last last month, establishing the state as a Second Amendment sanctuary.
Arizona House Passes Law to Nullify Biden's Federal Gun Control - Big League Politics
Needless to say, this idiotic ‘law’ is un-Constitutional – it clearly violates Article VI.
The supremacy of Federal laws is a fact settled, accepted, and beyond dispute; the states and local jurisdictions are subject to Federal laws and the decisions of Federal courts (see
Cooper v. Aaron (1958)).
Residents of the states and state and local lawmakers will obey and comply with all Federal laws – including Federal firearm regulatory measures.
If the residents of Arizona believe a given firearm regulation violates the Second Amendment, they’re at liberty to file suit in Federal court to seek to have that law overturned.
Wrong.
The basis for this law the belief that if states do not pass laws in areas they have specific superior jurisdiction, then federal government is allowed to act based on weaker jurisdiction, like the commerce clause or promoting domestic tranquility.
In this case a specific state law is needed, so that the federal government can not claim there is a void that required it to act. Federal laws only trump state law when there is equal jurisdiction. Since the 2nd amendment prohibits any federal jurisdiction, that is not the case here.
Article VI does not apply at all.
{...
All Debts contracted and Engagements entered into, before the Adoption of this Constitution, shall be as valid against the United States under this Constitution, as under the Confederation.
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.
The Senators and Representatives before mentioned, and the Members of the several State Legislatures, and all executive and judicial Officers, both of the United States and of the several States, shall be bound by Oath or Affirmation, to support this Constitution; but no religious Test shall ever be Required as a Qualification To any Office or public Trust under the United States.
[1]
...}
en.wikipedia.org
This has nothing to do with debt, treaties, or religious tests.
Federal laws are NOT and can NOT always be supreme because the states, municipalities, and individuals often are explicitly given superior jurisdiction directly by the Constitution.
Federal laws are only supreme when the constitution explicitly says so.