Article I, Section 10:
"No State shall, without the Consent of Congress, lay any duty of Tonnage, keep Troops, or Ships of War in time of Peace, enter into any Agreement or Compact with another State, or with a foreign Power, or engage in War, unless actually invaded, or in such imminent Danger as will not admit of delay."
Wouldn't that mean states such as Arizona, California, New Mexico and/or Texas have the right to repel the invasion of illegal immigrants AND the recent Arizona law would actually be Constitutional?