U.S. President Barack Obama (C) joins Santa Claus for a concluding Christmas carol during the 94th Annual National Christmas Tree Lighting ceremony on The Ellipse, near the White House, in Washington, U.S., December 1, 2016. Joining in (L-R) Chance the Rapper, First Lady Michelle Obama, James Taylor, Eva Longoria, Kelly Clarkson, Garth Brooks and Marc Anthony. REUTERS/Mike Theiler