This is the opportunity Trump is seizing on to declare himself king.
Trump has no right to override the States Rights provision of the USA Constitution Tenth Amendment (click here).
Police power is already being directed by States Rights with demonstrations that APPEAR to be disruptive. If the National Guard is necessary it is up to Governor Gavin Newsom and not Trump to deploy a unit or two. The California Governor can order the National Guard to stand down. The demonstrations are people disturbed for a real reason. This is not an emergency.