The Federal government requires local cooperation to enforce any such orders, they operate at the pleasure of local authorities. This limitation on Federal powe

The Federal government requires local cooperation to enforce any such orders, they operate at the pleasure of local authorities. This limitation on Federal power shows up routinely in other matters when local authorities disagree with Federal enforcement actions. Hence the reference to CBP and the Coast Guard, which do have authority to enforce such things at points of entry into the country. There are also strong restrictions on the scope of quarantine orders that would be allowed to circumvent due process in emergencies.