Weinstein's lawyers had been trying to negotiate to stop the transfer, but it had been expected to happen soon, his spokesperson Juda Engelmayer said.
"We will be fighting so that Harvey can receive his needed medical care and of course, so that he can be treated fairly," Engelmayer said. "Due process, presumption of innocence and a fair trial are all still his right."
A New York judge in June approved Weinstein's extradition to California, denying his lawyers' request to keep him at a state prison near Buffalo, where he is serving a 23-year sentence for a rape conviction last year, until the start of jury selection in the Los Angeles case.