IF China or Iran threatened our national credit rating and tried to drive up our interest rates, or if they sought to damage our education system, we would erupt in outrage. Well, wake up to the national security threat. Only it’s not coming from abroad, but from our own domestic extremists. We tend to think of national security narrowly as the risk of a military or terrorist attack. But national security is about protecting our people and our national strength — and the blunt truth is that the biggest threat to America’s national security this summer doesn’t come from China,...
