There are no rights and no legal protections fot anybody who is an illegal legal in any country.
What a stupid thing to say. It's illegal to murder anyone regardless of immigration status.
But I guess the guy who thinks he should be able to own an RPG isn't really that thoughtful about the nuance of law.
It should be said that "news" sites like this are a common right-wing grift: sell a story in the headline that that angry reactionaries will click on to get that hit of indignant rage.
If you think about the stories for five seconds, they fall apart; but clickfarms like the one in the link know that conservatives will spread incendiary headlines like this without even a shred of skepticism.
Their business model depends on it, and they're eating very well.