As important as building more miles of wall on the border is, it will do absolutely nothing to address one of the biggest problems with immigration in Texas, as President Trump just acknowledged.

Border Patrol agents at the Rio Grande Valley sector of Texas told me that the pieces of wall constructed in Texas right now are immensely effective in apprehending immigrants crossing from Mexico. But as Fox News reporter John Roberts said Friday to Trump in the Oval Office, the wall doesn’t actually sit on the border, separating the U.S. from Mexico.