If such things were possible, if I could be given unlimited power to change legislation, change the constitution, change the IRS code, change the budget, and hire personnel to enforce the legislation, I'd fix the problem of illegal immigration in a few months, with no need for a wall. Measures to be implemented:
1. Constitutional amendment to establish that for a child to be American, he or she needs to have at least one parent who is a legal citizen or a lawful permanent resident of the United States, even if the child is born within the territory of the United States. Bye bye, anchor babies.
2. Stiff penalties to any American or Foreign-based business that operates within the United States, for the offense (made to be a high-degree felony) of offering any jobs to illegal aliens. The owner and/or CEO of the company found to be guilty of such (as well as a number of highly placed officers like the CFO, high level hiring managers, etc., who were found to have participated in any way of those hiring practices), would be given mandatory, relatively long prison sentence with no possibility of parole; the business would have the license to operate revoked, and HUGE fines (of the going-out-of-business kind) would be imposed. Such businesses would also get a mandatory and thorough IRS audit of the last ten years of their business returns, extended to the personal returns of the high officers.
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6. Refugee status would not be allowed to be a proxy for economic migration. The status would have to be necessarily temporary (the resolution of the strenuous circumstances in the country of origin would trigger the return of the refugee to that country), subject to frequent review, and very tightly regulated to provide for true proof of need. The United States would only absorb refugees in the same proportion of the average of other developed countries.
7. Any immigrant visa of any kind would only be granted after thorough vetting to exclude anybody with demonstrable ties to terrorist organizations. This of course is already being done but should be done better.
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Do all of the above and illegal immigration comes to a screeching halt, no need for any wall.
Do the politicians want to do it? Of course not. They don't want to solve the problem, like I said in my last two posts.