It is a completely ridiculous idea, more so even the usual Trumposterousness. How will that work: armed soldiers doing guard duty along the wall, standing in sight of each other, with radios to call for back up should groups of Hispanics try to run the gauntlet? What does that do about the ones who come by boat at night along the California beaches, disembark, and make a run for it up the beaches to the Coast Roads? Even the Great Wall of Trump wouldn’t be able to do anything about that. How many troops would be required to do that kind of thousands of miles of standing guard duty? What if a shooting war broke out somewhere else and the troops were needed elsewhere and had to leave the border unguarded?
This is the price that’s to be paid for having a Commander In Chief who never served, knows nothing about soldiering and what’s involved logistically, and believes he has “make it so” saying power. Donald Dumb believes his own glibness and is too dumb to even know that he is dumb.