[Goose]

I think the concern motivating calls for simultaneous nationwide SiP is the problem of travel between states/areas of high and low infection. I don't know how big a problem that really is. I don't know if the states can legally limit that travel, but I think the federal government can.

Actually it’s not likely the Feds can. The USSC has held there is a Constitutional right to travel.

I think they can. The Feds have the ability to regulate interstate commerce. The States may not restrict interstate commerce without good reason, and must do so in a way that allows for due process, such as a hearing before someone can be prevented from entering the state. The Feds have no such requirement. I believe the Feds can regulate passage from one state to another to enforce the "national quarantine".  The USPHS has been explicitly delegated the power to do so.

[Goose]

I think the concern motivating calls for simultaneous nationwide SiP is the problem of travel between states/areas of high and low infection. I don't know how big a problem that really is. I don't know if the states can legally limit that travel, but I think the federal government can.

Actually it’s not likely the Feds can. The USSC has held there is a Constitutional right to travel.

I think they can. The Feds have the ability to regulate interstate commerce. The States may not restrict interstate commerce without good reason, and must do so in a way that allows for due process, such as a hearing before someone can be prevented from entering the state. The Feds have no such requirement. I believe the Feds can regulate passage from one state to another to enforce the "national quarantine".  The USPHS has been explicitly delegated the power to do so.