Article I, Section 10, Clause 3:
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.
In a sane world, someone would have pointed out they need an amendment for this.
I was stunned by the brazenness of his indifference to the population's Constitutional rights.
States currently have a lot of compacts with each other over a whole range of issues. Not sure where SCOTUS would be willing to draw the line.
And who has control of Congress now!