Scott said his proposal would make it easier for victims of police violence to sue police departments, rather than police officers.
"Convicting the killers will be a first step on the path to justice for families and an end to racist police violence against civilians."
City officials are urging protesters to remain calm as they prepare for civil unrest when the intensely graphic video footage is released.
The exhaust fumes of the police car against which Chauvin restrained Floyd on the road may also have contributed to Floyd's death.
About 100 Minnesota National guard troops will be dispatched to Minneapolis, CBS reported.
A video of the incident shows Cassif yelling at a policeman and then suddenly grabbed by the cop and several of his fellow servicemen and beaten.
Baker ruled last year that Floyd's death was a homicide caused by "cardiopulmonary arrest complicating law enforcement subdual, restraint and neck compression."
In London, police warned, "enforcement action will be taken, if needed, in the interests of public health."