Dude. He's already breaking the laws by sending people directly to CECOT. He's ignoring court orders and the need to get an order of removal for people. They're arresting people just for speaking Spanish without having a passport on them, like that Puerto Rican family.
If they're ignoring all the rules for people who can't pony up citizenship paperwork in time then there's nothing stopping them from quickly deporting a natural born citizen. Hell, anyone on the street without documents on their person is a valid target under the observed tactics.
They are not being honest with you.
The official attitudes about this are interesting. In some countries they're more worried about protecting the privacy of the accused. In other countries they identify the accused because they're worried about people being disappeared.