Civil disturbance means acts of violence and disorder prejudicial to the public law and order. It includes acts such as riots, acts of violence, insurrections, unlawful obstructions or assemblages, or other disorders prejudicial to public law and order. It also includes all domestic conditions requiring or likely to require the use of federal armed forces.
The NG has been involved with a Civil Disturbance protocol for a long time, I'd say at the very least illegal border activity fits these descriptions.
Perhaps we just need to define a disputed zone, Immigration has increased our population and
it could be argued we need to manifest some destiny once again. Zachary Taylor would have approved
https://www.history.com/topics/mexican-american-war