This is why (as I was going to comment on the previous thread), I think the idea of a Border Wall (whoever pays for) is not going to die off soon - regardless of how stupid an idea it is, or who is likely to pay for it - or not, or however ineffective/wasteful it might be.

Since (AFAICT) rage fueled by xenophobic prejudice seems to be the main driver of the “Trump base’s” attitudes on “immigration issues”, * Building The Wall is going to be promoted and supported by that base as a (literally) concrete expression of their exclusionary bigotry. All wrapped up in Very Serious Concerns about The Law, of course: but likely to shamble on as a zombie policy long after Trump is gone.

* and “economic anxiety”, too: though real economic anxieties, not just the glib citation of them as an excuse for voters’ prejudices. Not a carefully-examined issue.