"Oh, and as to immigration, it is also mentioned nowhere in the Constitution (unlike naturalization), and therefore is the responsibility of the states under the current legal regime, as it was in the early days of the republic. Constitutionally, which is not to endorse things otherwise, Arizona is entirely within its rights. No federal judge has authority to say it nay."
However, what Arizona faces is an invasion and that is mentioned in the U.S. Constitution in Article 4: "The United States shall guarantee to every State in this Union a Republican Form of Government, and shall protect each of them against invasion ... "
Yes, Arizona is within its rights to take action, but only because FedGov has completely abandoned its responsibility to protect the residents of the Grand Canyon state.