>>The reality is that Trump and Sessions will not be there forever. The wall would be.<<
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This point is crucial.
I remain very optimistic it will get built—perhaps through some of the mechanisms LS has suggested.
I think they want to get a foundation investment from Congress (e.g., $1.6B) and will take it from there.
Uh . . sorry to reply to my own post, but forgot to mention the foundation “investment” would allow them to flush out the legalities and get the Federal Government fully engaged in the management of the project.