Sources close to the Trump campaign said the tactic would survive legal challenges and pressure law enforcement agencies in blue states to take part in mass deportations.
This move is specifically described in Project 2025. The next step is that he will gut the DOJ, appoint his people, and have them pressure, remove, and prosecute any local DA who doesn't get in line.
The goal is to force very part of the legal apparatus to get in line with the fascist agenda.