Facebook CEO Mark Zuckerberg delivers the keynote speech during Facebook Developer Conference F8 2019 at the McEnery Convention Center in San Jose, California, United States on April 30, 2019. (Photo by Yichuan Cao/Sipa USA)
A mural painted by artist Shane Grammer is seen in a destroyed home in Paradise, California, United States on February 18, 2019. Three months after the deadly wildfire, the city of Paradise is in the process of recovery. (Photo by Yichuan Cao/Sipa USA)
U.S. President Donald Trump walks to members of the military from Marine One before making a speech at Marine Corps Air Station Miramar, San Diego, California (Photo by Yichuan Cao/Anadolu Agency)
Kate Lyn Moussavian (front left) and Zoe Brydon (front right) lead the march of Los Altos High School students during a walkout as part of global action on climate change in Los Altos, California, United States on March 15, 2019
North Korean leader Chairman Kim Jong Un's motorcade departs St. Regis Hotel at 8:10am in Singapore on June 12, 2018. (Photo by Yichuan Cao/Sipa USA)
Lily Collins attends the 2018 Breakthrough Prize at NASA Ames Research Center on December 3, 2017 in Mountain View, California. (Photo - Yichuan Cao / Sipa USA)
President Barack Obama appearing with former Secretary of State Hillary Clinton at Charlotte Convention Center, North Carolina, July 5, 2016
Two North Korean men can be seen on a speedboat, cruising down south on Yalu River towards the Sino-Korean Friendship Bridge in Dandong, Liaoning Province, China on October 30, 2018. (Photo by Yichuan Cao/Sipa USA)
Charlize Theron attends the screening of Tully during San Francisco International Film Festival at Castro Theatre in San Francisco, California on April 8, 2018. (Photo by Yichuan Cao/Sipa USA)
Apple Inc. CEO Tim Cook attends Stanford University's 128th Commencement in Stanford, California, United States on June 16, 2019. (Photo by Yichuan Cao/Sipa USA)
Senator Bernie Sanders holds a presidential rally at Fort Mason in San Francisco, California, United States on March 24, 2019. (Photo by Yichuan Cao/Sipa USA)
Democratic presidential candidate Sen. Elizabeth Warren holds a townhall in Oakland, California, United States on May 31, 2019. (Photo by Yichuan Cao/Sipa USA)
A memorial for the victims was set up after the mass shooting in Las Vegas, Nevada, that took 58 lives, October 28, 2017.
Jessica Alba attends “Refinery29’s 29Rooms: Turn it Into Art,” on June 20, 2018 in San Francisco, California, United States. (Photo by Yichuan Cao/Sipa USA)
North Korean waitresses wait inside the gate of a restaurant owned by North Korean government in an effort to attract customers in Dandong, Liaoning Province, China on October 30, 2018. (Photo by Yichuan Cao/Sipa USA)
An inflatable Trump Chicken is being displayed at San Francisco City Hall on April 15, 2017
Anti-Trump protesters gathered at 18th St. and Castro St. for a short rally, San Francisco, California, USA., November 13, 2016
Former Republic of China President Ma Ying-Jeou in San Francisco, California on April 10, 2018. (Photo by Yichuan Cao/Sipa USA)
Guests are seen during the Amazon Fashion Week Tokyo 2018 A/W on March 21, 2018 in Tokyo, Japan. (Photo by Yichuan Cao/Sipa USA)
Hundreds of people gather at Justin Herman Plaza in San Francisco to smack each other with pillows during the annual Valentine's Day pillow fight on Feb. 14, 2017.
A Secret Service agent stands guard as U.S. President Donald Trump settles into his presidential limo, known as "The Beast". President Donald Trump arrives at McCarran International Airport onboard Air Force One for Nevada Republican Party Convention on J
A young girl was holding a sign during a protest at SFO. Protesters gather at the International Terminal's arrival hall at San Francisco International Airport on January 29, 2017 against Trump's Muslim ban.
A North Korean civilian is seen riding bicycle on the eastern bank of Yalu River from Dandong, Liaoning Province, China on October 29, 2018. (Photo by Yichuan Cao/Sipa USA)
CA: Mubadala Silicon Valley Tennis Tournament
Nana Ou-Yang attends the 2018 Breakthrough Prize at NASA Ames Research Center on December 3, 2017 in Mountain View, California. (Photo by Yichuan Cao / Sipa USA)
A multi-color Donald Trump bust is found half-melted in what was formerly the garage of a house in Sonoma County, California. The house was completely burnt down by the fire that devastated Sonoma, Napa and Santa Rosa, October 17, 2017.