A Posterboard.

       Let's see what an import tax on Mexican goods to pay for the Trump Wall would mean. First, it would seriously upset our neighbor to the south. Second it would violate the terms of the NAFTA agreement, and third it would raise the costs of all products made in Mexico that we buy.
       What such an import tax would not do is hurt Mexico. Nor would Mexico pay that tax. We the taxpayers, we the consumers would pay that tax. So no, Trump would not be making Mexico pay for the Trump Wall, he'd be making us pay for the damn Trump Wall. Hey, if he wants that foolish wall, let him pay for it. That way he could paint his name all over it.
       And what about that wall? Does anyone believe that no matter how high it might be, there aren't ladders that are higher, and they can be built for a lot less money. Of course we could always use drones and radar and patrol agents to make sure nobody tries to cross over that damn wall. But couldn't we do all those things without building the Trump Wall? In fact I think we're already doing them. We just need to increase and improve those safeguards.
       Let's be honest, there is no way we can possibly stop every and all incursions. There will always be some few people who can steal across our borders. How about our ports of entry, our beaches, and yes, even our northern border. There simply is no way for America to become an impenetrable island unto itself. Lets get over ourselves. We can't secure our borders as Congress suggests without first resolving the immigration process. Modernizing our immigration laws would eliminate most of the illegal border crossings. So who needs a wall anyway. It'll just be a surface for graffiti.