Motorists line up for their COVID-19 vaccine a joint state and federal mass vaccination site set up on the campus of California State University of Los Angeles in Los Angeles,Tuesday, Feb. 16, 2021. (AP Photo/Jae C. Hong)

A woman receives the COVID-19 vaccine a joint state and federal mass vaccination site set up on the campus of California State University of Los Angeles in Los Angeles, Tuesday, Feb. 16, 2021. (AP Photo/Jae C. Hong)

Members of the National Guard work at a joint state and federal COVID-19 vaccination site set up on the campus of California State University of Los Angeles in Los Angeles, Tuesday, Feb. 16, 2021. (AP Photo/Jae C. Hong)

Members of the National Guard work at a joint state and federal COVID-19 vaccination site set up on the campus of California State University of Los Angeles in Los Angeles, Tuesday, Feb. 16, 2021. (AP Photo/Jae C. Hong)

A federally-run COVID-19 vaccination site is seen on the campus of California State University of Los Angeles in Los Angeles, Calif., Tuesday, Feb. 16, 2021. (AP Photo/Jae C. Hong)

California Gov. Gavin Newsom speaks during a news conference at a joint state and federal COVID-19 vaccination site set up on the campus of California State University of Los Angeles in Los Angeles, Tuesday, Feb. 16, 2021. (AP Photo/Jae C. Hong)

Power lines are shown Tuesday, Feb. 16, 2021, in Houston. More than 4 million people in Texas still had no power a full day after historic snowfall and single-digit temperatures created a surge of demand for electricity to warm up homes unaccustomed to such extreme lows, buckling the state's power grid and causing widespread blackouts. (AP Photo/David J. Phillip)

A Home Depot parking lot is covered in snow in the Westbury neighborhood, Monday, Feb. 15, 2021, in Houston. A winter storm making its way from the southern Plains to the Northeast is affecting air travel. (Mark Mulligan/Houston Chronicle via AP)

A National Guardsman walks across a federally-run COVID-19 vaccination site as motorists wait to get their vaccine on the campus of California State University of Los Angeles in Los Angeles, Calif., Tuesday, Feb. 16, 2021. (AP Photo/Jae C. Hong)

Members of the National Guard help motorists check in at a federally-run COVID-19 vaccination site set up on the campus of California State University of Los Angeles in Los Angeles, Tuesday, Feb. 16, 2021. (AP Photo/Jae C. Hong)

Motorists line up for their COVID-19 vaccine a joint state-federal mass vaccination site set up on the campus of California State University of Los Angeles in Los Angeles, Tuesday, Feb. 16, 2021. (AP Photo/Jae C. Hong)

A truck drives past a highway sign Monday, Feb. 15, 2021, in Houston. A frigid blast of winter weather across the U.S. plunged Texas into an unusually icy emergency Monday that knocked out power to more than 2 million people and shut down grocery stores and dangerously snowy roads. (AP Photo/David J. Phillip)

Motorists wait to get their COVID-19 vaccine at a federally-run vaccination site set up on the campus of California State University of Los Angeles in Los Angeles, Tuesday, Feb. 16, 2021. (AP Photo/Jae C. Hong)

A pedestrian crosses Market Street during a snow storm in downtown St. Louis on Monday, Feb. 15, 2021. The brutally cold weather is expected to continue through Saturday with more snow in the forecast for Wednesday and Thursday. (David Carson/St. Louis Post-Dispatch via AP)