Quarantine: How Does It Work ??
I think Trump made sense when he talked about a quarantine for the NY-NJ-CT region. Instead they issued a strong travel warning.
OK, that’s the way it is—for better or worse.
Here is some background on quarantine.
The federal government is empowered to take measures to prevent the spread of communicable diseases between states,
That means Trump can ban people from leaving their state.
It has never been tested in the modern era - and in rare cases when any quarantine was challenged, the courts generally sided with public health officials.
Courts have ruled consistently for years that the authority to order quarantines inside states rests almost entirely with the states, under provisions in the Constitution ceding power not explicitly delegated to the federal government to states.
The federal government, though, would have power under constitutional clauses regulating commerce to quarantine international travelers or those traveling state to state who might be carriers of deadly diseases.