I believe the president, using his executive powers to declare an emergency, can declare martial law in the affected areas. That would replace 2000 working INS officers with ten of thousands of troops. Identify and deport by military transport, overcome resistence. Release martial law. Rebuild.
Ok, I know it would take one hell of a Buford Pusser, but it appears to me, it's either that or let it esculate to where the people start to handle it, resulting in martial law for sure.
Or we can just give California to Mexico. Give US citizens a month to get out. If it's ignored, it can't help but spread to the entire state with that result anyway. 