Border: When the Justice Department sued Arizona Tuesday for the grievous crime of protecting its border, it did more than just signal a softer policy on immigration. It also put our national security at risk. 'A state may not establish its own immigration policy or enforce state laws in a manner that interferes with the federal immigration laws," the U.S. wrote in its complaint. But Arizona isn't "interfering" at all. It's just doing what should be Uncle Sam's job — protecting our border. Arizona should get a presidential commendation, not a lawsuit. It's bad enough that bankrupt U.S. states have...