... As national martial law has not been imposed, it is up to the governors of each state to respond to the virus as best they see fit, with the support of the Federal government.
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Hold it right there. Since there is no Constitutional basis for martial law, the decision is ALWAYS up to the governors, except, perhaps, where interstate commerce is involved.
Except there is precedent otherwise - and remember that the Feds have successfully used “interstate commerce” to justify in-state meddling.
Point is, though, that there has been no national martial law, there isn’t likely to be any national martial law unless things get exponentially worse to the point where state governments can’t function, and until and unless that happens, the governors are where the buck stops in each state.