I have a better idea. Revoke international status and flight paths to every city and state that claims to be a sanctuary.

If you fly from one to another international airport you go through ICE right after getting off the airplane.

Sanctuary cities are 100% rogue. Anyone who supports or advocates for them should be treated as foreign agents as they are in direct opposition of the sovereignty of the nation.

Considering the number of these people, I don't know what can realistically be done with them, but they should absolutely have voting rights suspended.