Trump doesn’t speak very well and “some are good folks” makes it seem he is saying the majority are not. He also said immigrants not illegal immigrants but I assume he later made it clear or it was clear from the context that he was talking about illegal immigrants. Still he needs to learn to speak more clearly.
If you read the transcript, he IMMEDIATELY relates his conversations with border guards, putting the entire color of his remarks in context. He was speaking about illegal aliens.
That's true but what he meant was still absolutely clear. But being more precise would make it harder for open-borders liars to distort his meaning.