On Tuesday's broadcast of "The O'Reilly Factor," Washington Post columnist Charles Krauthammer gave his solution to the crisis at the southern United States border: a fence. He argued that securing the border with a fence is a proven method and he pointed to other places where it has worked, including at 1600 Pennsylvania Ave. in Washington, D.C. "Alright, here's what I've been on for years," Krauthammer said. "You start with a fence. It's very simple. People say, 'Oh, fences don't work. You make a ladder.' Well, then you build two fences, triple strand fences. San Diego did that in the...