Governors are easiest to snag.
Here is how you do it.
ICE hand delivers a letter to governor of state X requesting state co-operation in specific investigation/operation to identify and remove illegal aliens.
ICE gives them twenty four hours to respond or DOJ will indict the governor for obstruction.
Rinse and repeat—governor after governor after governor.
Specific cases and details makes conviction more likely.
Most important of all—never worry that some cases may not lead to conviction. It is the law of large numbers. The more indictments you do the more convictions you get.
The perfect is the enemy of the good.
States are sovereign and cannot be commandeered by the federal government to enforce federal law. The decision also applies to counties, Indian reservations and sheriffs.
https://caselaw.findlaw.com/court/us-9th-circuit/1387841.html