Dr. Anthony Fauci, the top U.S. infectious disease expert, wears a face mask as he arrives for the the White House COVID-19 Response Team's regular call with the National Governors Association in the South Court Auditorium in the Eisenhower Executive Office Building on the White House Campus, Monday, Dec. 27, 2021, in Washington. Fauci says the U.S. should consider a vaccination mandate for domestic air travel as coronavirus infections surge. To date the Biden administration has balked at the idea, anticipating legal entanglements. (AP Photo/Carolyn Kaster)
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