I'm fairly certain that Constitutional speaking "interstate commerce" can only be regulated by the federal government. The free movement of people may not be co

I'm fairly certain that Constitutional speaking "interstate commerce" can only be regulated by the federal government. The free movement of people may not be commerce per se, but it is inextricably linked. In realpolitik terms, I doubt the federal government can stop this. What are they going to do? Send the army to force states to accept potentially infected people? That's basically an order to go kill your countrymen. I'd hope, given such an order, much of the military would defect.