<p>U.S. President Joe Biden, center, First Lady Jill Biden, left, and LL Cool J attend the National Christmas Tree lighting on the Ellipse in Washington, D.C., U.S., on Thursday, Dec. 2, 2021. Biden today called on health providers to expand the availability of coronavirus vaccines and booster shots, aiming to combat a winter surge of infections, and hold off the new omicron variant. Photographer: Oliver Contreras/Sipa/Bloomberg via Getty Images</p>
