It's about time!
Ditto!
Depends on the ROE's (Rules of Engagement). The US Border Patrol has been operating under French ROEs for literally decades:
Run and Hide
Surrender
Collaborate
No fault of the Border Patrol. But those have been the orders of the last three or four administrations.
Btw, the President can't order the state guards to do anything unless he federalizes them as was done for the deployments overseas. So why not use the Army? It IS a foreign invasion. It is the job of the US military to secure our borders. No Constitutional conflicts unless the military participates in law enforcement activities. But Mexican troops on our soil? FIRE "EM UP! My guess is that if the Prez directs the governors or asks them to put their guard on the border then it becomes a state fiscal responsibility with some federal help, of course.