A group of civil rights lawyers who have represented families affected by police violence have asked key members of the U.S. Congress to support but also amend the George Floyd Justice in Policing Act of 2020.

The lawyers said they don’t want to see the act amended in any way that would dilute one of its key provisions—eliminating immunity protection for police officers from liability for abuse. But they said it’s even more important to remove liability protection for police departments and governments—which is “even more devastating to victims” of police violence.