Chris Magnus, Tucson's chief of police, has joined dozens of current and former prosecutors and law enforcement officials in the fight against moves by the federal government to entangle them in cracking down on illegal immigrants.

The bill, H.R. 5063, the Stop Settlement Slush Funds Act of 2016, targets a loophole that allows settlement agreements reached with the Department of Justice to include payments to groups unaffected by the action being settled.