President Trump's dangerous purge

The best-case scenario is that President Donald Trump's firing-by-Twitter of Defense Secretary Mark Esper on Monday was a reckless act of vindictiveness by a lame-duck president who wanted to settle a score. The worst is that it is the beginning of a decapitation of national security agencies that could leave the country rudderless at a sensitive moment, and perhaps open the way for Trump to engage in dangerous adventurism at home or abroad. Either way, Esper's "termination," as the...