Trump’s the one not mentally fit for the presidency

News Snapshot:

It is unclear whether Donald Trump has forgotten the precise nature of NATO or whether he ever fully grasped it in the first place. What is clear, however, is that Trump — who ostensibly spent four years as president of the United States — has little clue about what NATO is or what NATO does. And when he spoke on the subject at a rally in South Carolina over the weekend, what he said was less a cogent discussion of foreign policy than it was gibberish — the kind of outrageous nonsense that flows without interruption from an empty and...