Conservative commentators have tried to morph Trump's quote to mean "when we improve our system of vetting."
But that isn't what Trump said. He explained himself a few times - he means "until we figure out why they hate America."
It's child-like. The popularity of Trump is stunning to me, and is telling me something about Americans that I don't really want to know. We're still a pretty stupid country, and when we're afraid, we'll support just about anything.
Hitler was an evil man, and I don't think Trump is Hitler - but a lot of what is happening now is VERY similar to what happened in Germany in the '30's.