Increased border security is required, sure. But if you really want to halt the flood of undocumented immigrants, do what Homeland Security Secretary and retired Marine general John F. Kelly recommends: everything in our power to support and bolster Mexico's economy, so that people will have no motive for trying to sneak into the United States.
Instead, the Trump administration is talking about blackmailing Mexico by threatening to hurt its economy. Taxing Mexican goods imported into the United States in order to pay for Mr. Trump's mythical wall will not simply mean that it will still be the American taxpayer who foots the bill. It will also increase the motive for poverty-stricken Mexican seeking a better life to sneak across the border!
By the way... come to think of it, wouldn't Pink Floyd's "Just Another Brick in the Wall" be a great anthem for the entireTrump movement? Not just the title, either. Consider the lyrics!