Former President Donald Trump likes to focus on one particular purported consequence of the influx of migrants coming into the U.S. from the southern border: an increase in crime. There’s just one problem, according to an NBC News report: Trump’s supposed increase in crime isn’t happening. In fact, crime is broadly down around the country — and it’s down the most in many of the cities that have seen the largest numbers of migrants. “You know, in New York, what’s happening with crime is it’s through the roof, and it’s called ‘migrant crime,’” Trump told a recent Michigan rally. “They beat up po…