Here's the official White House video of the bipartisan meeting Trump held at the White House a few days ago.
Trump repeats, regarding the visa lottery system, his frequent complaint that nefarious "countries" are not sending their "best" as immigrants.
...Cancel the lottery program. They call it "visa lottery." I just call it "lottery." Where countries come in and they put names in a hopper. They''re not givin' you their best names. Common sense means they're not givin' you their best names. They're givin' you people that they don't want. And then we take them outta the lottery. And where they do it by hand, where they put the hand in a bowl, and probably what's in their hand are the worst of the worst. But they put people that they don't want into a lottery. And the United States takes those people.
Yes, I know that Trump never met a superlative that he didn't like. But in this case, to me, "the worst of the worst" doesn't seem like just a superlative. It implies that those countries are "the worst" to begin with, so that people with that national origin are likely to be shit produced by a shithole place. And then he says that we're getting "the worst" of those people.
Whether or not he actually used the word "shithole" off the record a few days later, it seems consistent with his on-record vibe.
Basically, he starts with the assumption that people from a certain country are no good, and then he goes on to say that we're getting the worst of that no-good country's people.
The definition of prejudice is to use things like national origin to pre-judge
people. This is what Trump has done constantly, even if he occasionally waters down his comments about Mexico sending us rapists with a hasty "and also some good people" tacked on at the end.
His base loves these public demonstrations of Trump's prejudice, because it's a prejudice flattering to the superiority of their own whiteness.