Senator Barack Obama (D-IL) (R) stands in front of Senator Hillary Clinton (D-NY) as they arrive for U.S. President George W. Bush's annual State of the Union speech to a joint session of Congress at the U.S. Capitol in Washington in this January 23, 2007 file photo. Hillary Clinton announced her second run for the presidency on April 12, 2015 starting her campaign as the Democrats' best hope of fending off a crowded field of lesser-known Republican rivals and retaining the White House. (Photo by Larry Downing/Reuters)

Boys play with a drainage culvert used for flood control in Las Pinas, Metro Manila February 28, 2016. (Photo by Erik De Castro/Reuters)

A person viewing the Northern lights over the lava landscape, Reykjanes Peninsula, Iceland. (Photo by Arctic-Images/Getty Images)

A girl uses her mobile phone during the evening at the National Park in Khartoum, Sudan, April 24, 2015. (Photo by Mohamed Nureldin Abdallah/Reuters)

U.S. Army helicopters providing support for U.S. ground troops fly into a staging area fifty miles northeast of Saigon, Vietnam, August 28, 1966. Helicopter fuel is stored in the large rubber tanks, foreground. (Photo by Henri Huet/AP Photo)

Photo taken on January 3, 2018 shows the snow-light show at the Sun Island International Snow Sculpture Art Expo in Harbin, capital of northeast China's Heilongjiang Province. Snow Wonderland, a 3D snow-light show applying modern sound, light and digital technologies has been displayed at Sun Island International Snow Sculpture Art Expo recent days. (Photo by Wang Jianwei/Xinhua via Getty Images)

A demonstrator uses a TV case as a facemask during a protest to demand justice for Daniel Prude, on September 3, 2020 in New York City. Protests were planned in New York September 3 over the death of Daniel Prude, a black man that police hooded and forced face down on the road, according to video footage that prompted a probe from the state's attorney general. (Photo by Kena Betancur/AFP Photo)

A man wearing a mask walks past the “Christmas Cab” sculpture displayed along Fifth Avenue on December 02, 2020 in New York City. The annual Holiday Sculptures display is organized by the Fifth Avenue Association and consist of 10 sculptures that runs from 50th Street to 59th Street. (Photo by Alexi Rosenfeld/Getty Images)