When they're attacking Puerto Ricans–each and every one of whom is as American as everybody else in the United States (and certainly more so than someone like Elon #Musk, whose citizenship is based on desire for profit, not love of country) they show that what they're concerned about isn't *immigration* at all.
They just hate people who don't look like them, sound like them, believe like them.
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There is an assumption that Musk is a citizen. Aside from Wikipedia, I’ve yet to find proof.