President Trump had been vocally considering shutting down the southern border until he scaled back slightly on Thursday, giving Mexico one year to decide whether or not they'll comply with his demands. His White House team probably talked him back from the ledge, since it seems he’s the only one in his own administration willing to take such a drastic step. Indeed, senior staffers and Department of Homeland Security officials view closing ports of entry, what Trump calls a border shutdown, as a method of “last resort.” It’s not often that Trump entirely turns his back on his administration’s 2...