Trump has been claimed to be very racist from second-hand sources. If that's so, he does a good job of keeping it out of the public eye. All of his policies conveniently keep people of color out of the country without mentioning their ethnicity.
http://gawker.com/the-collected-quotes-of-donald-trump-on-the-blacks-1719961925
And then there's this
Trump
"Number one, I am the least anti-semitic person you've ever seen in your entire life. Number two, racism, the least racist person"
So basically he's the "least racist person we've ever seen."