A report indicated a section of the wall is already displaying structural troubles.
news.yahoo.com
Now, why would a wall, dubbed a "Lamberguini" of a wall by the builder, costing millions, and built by a private contractor who regularly contributes to GOP candidates, begin to erode the foundation and deteriorate so badly that repairs are needed in less than 4 years?
It's falling apart because he played the U.S. American people as fools, in order to get elected. If he wanted Mexico to build the wall, he could have signed an executive order, rounded up the illegal immigrants, and then as punishment, as prisoners of war; forced them to build the wall as part of their hard labor sentence after appropriating all and any foreign Mexican asset in the nation, and seizing and selling off the assets of the illegal immigrants themselves.
But... Seems as though he's not that interested in building the wall, or stopping illegal immigration. Just another waste of U.S. money and time and brainpower.