Comment: Look, Trump is such a simpleton that he thinks:
a. A 2000 mile wall costing billions is good international policy.
b. His real estate background makes him uniquely qualified to build this wall.
c. His voters will love him for going forward with the wall.

Now clearly points a and b are absurd. Trump shows here, as he does in every action or word or tweet, how pathetically out of his depth he is. Point c, however, is the reason Trump is in the White House. As H.L Mencken wisely observed - "For every complex problem there is an answer that is clear, simple, and wrong." Trump's reality show honed air of faux confidence convinced sixty million Americans that his clear and simple answers were their salvation. His supporters are too thick to appreciate Mencken's wisdom, and Trump is too busy reveling in their adoration to care.