U.S. Attorney Bill Essayli pulled together an all-star federal taskforce comprising agents from five federal law enforcement agencies—including ICE and the FBI—all working out of an office in Los Angeles. When an illegal alien with a prior deportation is inevitably arrested, upon identification and booking into the local jail, the taskforce seeks a federal criminal warrant—signed by a federal judge—for felony re-entry under 8 USC §1326.
By using available criminal databases to find illegal aliens who were arrested and jailed the day before, the team quickly learns of each new offender. Then, a federal warrant is served on local officials, who obviously won’t buck a federal judge’s warrant. That warrant requires local officials to hand over the illegal criminal alien to ICE.
The critical point is that reentry after having already been deported is a felony, and by getting a federal criminal warrant the government can legally force state and local compliance (which they cannot in a civil matter). That is the rule of law as it stands. It also sets up a dynamic of high-profile "heads I win tails you lose" fights with state & local officials who don't want to comply, providing grist for the base.
https://www.heritage.org/border-security/commentary/sanctuar...