Art 6 para 2. It applies to the States as well.
We've been over this before and yet you continue to spout the same drivel thread after thread.
I'll stop as soon as you can prove it applies to the states. Every single U.S. Supreme Court ruling, every federal Circuit Court ruling, every District Court ruling says it does not.
Article VI, Section 2 says the constitution is binding on both the federal government and the states. It does not mean that everything IN the constitution applies to the states -- if it did then the states can print money.