GOP Assemblyman Tom Lackey said Republicans were looking for a way to reverse Newsom's action but hadn't yet figured out how.
She continued: "I have met with and am very supportive of Governor Newsom and his decision to help bring an end to the California Death Penalty".
Stanislaus County District Attorney Birgit Fladager, president of the California District Attorneys Association, also criticized Newsom for circumventing the will of a majority of voters. As with so many other issues - climate change, abortion, taxes - there is a wide gulf on how states approach capital punishment.
"Our death penalty system has been - by any measure - a failure", Newsom states in prepared remarks he is expected to deliver on Wednesday.
Studies show the death penalty disproportionately affects minority communities and people with mental illnesses.
The lethal injection chamber at San Quentin State Prison, photographed in 2010. The order will also immediate close San Quentin State Prison's execution chamber and put an end to the state's continued efforts to find a constitutional method for lethal injection, The Los Angeles Times reported. A state's chief executive should have the authority to suspend such operations if that's truly what is happening. "He said he's not going to allow executions on his watch to the extent that he can". His administration's regulations are stalled by challenges in both state and federal court, though those lawsuits may be halted now that Newsom is officially withdrawing the regulations.
California voters have repeatedly rejected abolishing capital punishment but there is a court imposed moratorium on the death penalty.
Among the most notorious inmates is Lonnie David Franklin Jr, also known as the "Grim Sleeper", who was sentenced to death for 10 murders between 1985 and 2007.
"When he told me that, a little piece of me died", he said.
Another key point of Newsom's argument is the wrongful conviction and subsequent overturning of inmates on death row.
There hasn't been an execution in California since 2006, amid a years-long legal battle over the state's drug cocktail.
"You can't make this up, Anderson", the governor said. It says innocent people have been sentenced to die, including five Californians since 1973 who were found to have been wrongfully convicted. What might have seemed avant-garde decades ago, isn't anymore: The governors of Colorado, Oregon and Washington state have issued moratoriums on executions in recent years.
Democratic assembly member Marc Levine of Greenbrae plans to seek the two-thirds vote the Legislature requires to put another repeal measure on the 2020 ballot.
Newsom told reporters last month that the prospect of executions resuming has been weighing on him.