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Pull all federal assistance and grants from any local jurisdiction claiming “sanctuary city” status, or refusing to cooperate with the Federal Government in enforcing federal law initially. If that doesn’t straighten them out, then declare that jurisdiction in rebellion against the United States and take over the government there with Federal Agents.
Adopt legisaltion to put any business which knowlingly hires illegal aliens out of business, liquidate their assets, and use the funds to defray the cost to the public of housing, and repatriating illegal aliens.
Arrest and bring charges against individuals such as those in Wind of the Spirit who provide aid and assistance to illegal aliens in evading Federal Immigration Laws.
Build a physical border fence with Mexico complete with the most modern barrier technology.
Seize Mexican assets in the United States and liquidate them to defray the costs of apprehending, incarcerating and repatriating illegal invaders from Mexico.
Enact legislation on the Federal Level making it illegal for any local jurisdication to mandate provision of social benefits of any kind except those of an urgent, immediate and temporary nature, to illegal invaders, pass a Federal Law recognizing English as an official language, pass legislation to stop the employment of bilingual forms, etc in other langauges, and pass legislation clarifying that the Constitution does not in fact grant citizen status to individuals born in the United States if their parents are illegally here.
Do all of that and the illegal alien problem will end, without taking much direct action against illegals. They will be forced to leave.