FILE - In this Jan. 15, 2021, file photo, Governor Gavin Newsom addresses a press conference held at the launch of a mass COVID-19 vaccination site at Dodger Stadium in Los Angeles. California has lifted regional stay-at-home orders statewide in response to improving coronavirus conditions. Public health officials said Monday, Jan. 25, 2021, the state will return to a system of county-by-county restrictions intended to stem the spread of the virus. Gov. Newsom imposed the stay-at-home order in December as coronavirus cases worsened and are expected to address the public later Monday. (Irfan Khan/Los Angeles Times via AP, Pool, File)

FILE - In this Friday, Jan. 15, 2021 file photo, COVID-19 mass-vaccination of healthcare workers takes place at Dodger Stadium, in Los Angeles. Mutations to the virus are rapidly popping up and the longer it takes to vaccinate people, the more likely it is that a variant that can elude current tests, treatments and vaccines could emerge. (Irfan Khan/Los Angeles Times via AP, Pool)

Congressman Jimmy Gomez addresses a press conference held at the launch of a mass COVID-19 vaccination site at Dodger Stadium, Friday, Jan. 15, 2021, in Los Angeles. (Irfan Khan/Los Angeles Times via AP, Pool)