Trump's point is very valid. With your own country on-fire with crime, rape, murder, starvation, and disease, why would you travel thousands of miles to try to fix what you perceive as "racism" in a country you have nothing to do with and no connection?
Seems natural that you would care for your own family, relatives, and neighbors FIRST, before you start trying to fix some distant country you have no grounds to worry about. Yes! My country is on-fire! So my solution is to flee thousands of miles to the richest most powerful nation on Earth, so I can make them more like the country I abandoned and escaped from.
Really? You really think that's a good idea? Amazing...