I was wondering this too. Sounds like they just get more militarized gear to up intimidation.
Imagery for his gullible, uninformed base. The Trump administration is trying to paint immigrants as so dangerous that the presence of specialized militarized law enforcement is required in sanctuary cities.
After fighting that war and not reckoning with its own history of targeted abuse and oppression of the disenfranchised and general inhumanity this reality was certain to sneak up on America. The Nazi regime held up a mirror of what the US had the potential to become if it didn't make a concentrated effort to oppose bigotry and the only people to heed the warning were marginalized groups.
I drive through a border patrol checkpoint regularly. They are fatties who couldn't climb a rope.
"Sanctuary city" just means that the local government refuses to cooperate with ICE. It doesn't mean they have any legal power to stop ICE from operating there.