I think I heard somewhere, could be wrong, that trump's team is floating the idea of putting a wall tax on all tacos sold in the US. Or perhaps he'll render tariffs on your lunch-time chalupa. Big money there. He could, as dictators can do as they don't have to actually have Congress do such a thing, levy a tax on each bottle of Dos Equis (sp, not the brand). After all he is the most orange-interesting derp in the world.
Likely though he'll have Tea Bag Concrete pour the 20ft high slabs in the image of the Berlin wall, complete with barbed-wire on top and a no man's kill zone beyond. Only this time they'll be shooting people as the climb over and run FROM the US.