Article I Section 10No 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.
Article IV Section 4The United States shall guarantee to every State in this Union a Republican Form of Government, and shall protect each of them against Invasion; and on Application of the Legislature, or of the Executive (when the Legislature cannot be convened) against domestic Violence.
-PJ
Further, as the House has not exercised its Constitutional duties to withhold funds to oppose Obama's lawlessness, the States must act in their own interests. The Federal Government can make no further claim that is responsible for enforcing immigration as it is plain that it is complicit in the collapse of the border and unrestrained entry of illegal aliens into the United States.