Presidential Emergency Powers«
I. Powers over Persons:
A. Confine any individual deemed a threat to national security;
B. Restrict travel to or from U. S.;
C. Restrict access to U.S. citizenship;
D. Restrict movement of individuals within and over the U.S.;
E. Require certain individuals to register with the government
https://spot.colorado.edu/~mcguire/emergency.html
Good info, CB, on the emergency declaration powers of the President.