Here is the actual quote you are defending:

    TRUMP: "When Mexico sends its people, they're not sending their best -- they're not sending you [points at unidentified people off-camera] -- they're not sending you -- they're sending people that have lots of problems, and they're bringing those problems with us.  They're bringing drugs; they're bringing crime; they're rapists and some, I assume, are good people."

There is no apparent indication in that video that the people he's pointing at are Mexican.