And here's the Oxford Dictionary's definition of that term: "a foreign national who is living without official authorization in a country of which they are not a citizen."
So maybe the Left likes to change our language to demonize people who speak facts, but the fact remains that these people from other countries that illegally cross the southern border to live here illegally are illegal aliens.
Well, yeah, it has been an official term for quite a long time, so there's no arguing that. However, that doesn't mean that some people don't like it.