Since when is protecting the border from foreign invasion a duty for law enforcement to handle?
Dear God I despise the MSM. Every sentence a little propaganda bomb.
“Since when is protecting the border from foreign invasion a duty for law enforcement to handle?”
In this rare case, it is true.
The Posse Comitatus Act of 1878 was designed to keep the Military out of Domestic law Enforcement.
There are emergency exceptions (like Hurricane Katrina, the LA Riots), and the National Guard can exercise Law Enforcement authority on behalf of State Governors (if ordered), but the Active Duty Military is supposed to stay out of enforcing domestic laws.
Individual lawbreakers (even if foreigners), who are unarmed non-combatants, are not military targets for the use of lethal Military force, under the laws of war. So there is no automatic legal exception to Posse Comitatus for border enforcement as an invasion (not an organized military force).
What the Military has been doing, is providing lots of other support functions, to free up the badged Border Patrol Officers to conduct arrests.
The Military does a lot of direct surveillance, and pulls shifts in the command posts, watching the screens, in place of Border Patrol Officers. They are flying planes, driving trucks, providing maintenance and medical services. Combat Engineers are hardening the Ports of Entry with crowd control infrastructure, and emplacing hundreds of miles of concertina per year, between Ports of Entry (most of it now is going on top of new bollard Wall System, after the contractors are finished).