"When Mexico sends its people, they're not sending their best. They're not sending you. 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." [0]

There's a whole lot of bigotry to unpack in that, but the biggest is the implied conspiracy in which undocumented immigrants are sent by Mexico.

In fact, when Mexico is sending their people, it's quite different. [1]

[0] https://www.washingtonpost.com/news/post-politics/wp/2015/06...

[1] http://www.cbsnews.com/news/mexico-sends-first-ever-aid-nort...