Let me start off by saying I would never vote for Trump unless he was running against Jimmy Fallon. And only because he’s way funnier.
Now, Trump was clearly referring to Mexicans who were crossing the border illegally, which already, by definition, makes them criminals.
And he said:
“When Mexico sends its people, they’re not sending their best”.
You can easily see here that he’s referencing the events that happened before involving the Cuban government, which were depicted in the movie Scarface, which was brought up earlier, by implying that it’s the Mexican government throwing over their criminals, because normal Mexican crossing the border legally clearly aren’t doing so at the behest of the government.
“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…”
Of course, this is bullshit and clearly meant to rile up the crowd regarding illegal immigration and trying to convince them that he will get back at the Mexican government by making them “pay for the wall”, which he’s obviously never going to do.
And he even goes as far as to say:
“And some, I assume, are good people.”