Because that’s what they are.
How do you “dub” somebody in the U.S. illegally as being “dubbed” an illegal alien. You don’t need to “dub” them because they already are illegal aliens.
We need to watch this one. we must hope they are removed from our country without a hearing. If these gang members get to stay until each one gets a hearing we are screwed but good. That will mean that hack Judges orders will be followed and millions of illegals get to stay until each one gets a hearing which will tale decades.