The deaths bring the total to 29 since December when racing season began.
“I continue to be troubled by the horse deaths at Santa Anita Park,” Newsom said. “Enough is enough.”
Newsom went on to say that there shouldn’t be any races until the horses are examined by independent veterinarians and found fit to compete.
Meanwhile, the track’s owners are being sued by nine activists.
New video, connected to the lawsuit, was released by the plaintiffs Sunday. They are suing for unspecified punitive damages — and the right to protest outside the track.
They said they were prevented from protesting and were assaulted by park security on March 3.
Horse racing season is scheduled to end June 23.
Marin also said Santa Anita was expected to release a statement regarding the latest horse deaths but as of 8 p.m. they had not.