I think it's all a matter of enforcement, though I don't know what the particular federal laws concerning that are.
I don't see how the federal government can over-ride a state's sovereignty by forcing them to keep their own border open to international traffic.
The feds can try, but as I said, it's a matter of enforcement. Who's gonna stop a border state from closing off the traffic coming across the border into their state? Obama? Napolitano? LOL!
Thanks for your opinion. We are in Texas where they are closing ALL schools. Very scary.
THE BORDERS NEED TO BE CLOSED. I AM BEGINNING TO GET OUTRAGED! (sorry for shouting)