This is replacement theory. It is a debunked white nationalist conspiracy theory that was normalized by Tucker Carlson. It’s a blatant lie meant to turn Americans against immigrants.
Reposted from Aaron Rupar
Musk: "The waste and fraud in entitlement spending -- that's the big one to eliminate. That's the half trillion, maybe 600 or 700 billion a year. That's also the mechanism by which Democrats attract & retain illegal immigrants by essentially paying them to come here & then turning them into voters."

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