Article 6 of the US Constitution means that ratified treaties pre-empt state law. It has nothing to do with federal law. See Ware v. Hylton (1796) and McCulloch

Article 6 of the US Constitution means that ratified treaties pre-empt state law. It has nothing to do with federal law. See Ware v. Hylton (1796) and McCulloch v. Maryland (1819). Treaties that conflict with federal law are null and void; Congress has to pass legislation if they want to make any such conflicting requirements effective. The same applies to treaties that attempt to restrict constitutional rights: such provisions have no force nor can Congress enact them. That would require an amendment.