States can use force to defend against invasion. A State and Congress are the only authorities to enter into War.
States use force to combat the illegal drug trade. The governor has the state police at his disposal to this end. The governor of Arizona could order SWAT units of the state police to eliminate the wetback threat in those areas.
That's why I'm skeptical that the situation exists. I find it very hard to believe armies of drug smuggling armed wetbacks have commandeered such huge sections of Arizona.