A banner celebrating a college graduate of the University of Virginia hangs outside a home, following the postponement of a live graduation ceremony due to the coronavirus disease (COVID-19), in Alexandria, Virginia, U.S., May 18, 2020. REUTERS/Kevin Lamarque

Sisters Sydney Seip and Paisley Seip watch the "Graduate Together: Class of 2020 High School Commencement" for millions of high school seniors who will miss graduation ceremonies due to the coronavirus disease (COVID-19) outbreak, while celebrating their canceled prom night at home in San Diego, California, U.S., May 16, 2020. REUTERS/Bing Guan

Torrey Pines High School graduating student Phoebe Seip, 18 (right) and her sisters Paisley, 6, and Sydney, 22, watch musician Nick Jonas deliver a virtual commencement address to millions of high school seniors who will miss graduation ceremonies due to the coronavirus disease (COVID-19) outbreak, while celebrating Phoebe?s canceled prom night at home in San Diego, California, U.S., May 16, 2020. REUTERS/Bing Guan

Torrey Pines High School graduating student Phoebe Seip, 18 (right) and her sister Sydney, 22, watch former United States President Barack Obama deliver a virtual commencement address to millions of high school seniors who will miss graduation ceremonies due to the coronavirus disease (COVID-19) outbreak, while celebrating Phoebe's canceled prom night at home in San Diego, California, U.S., May 16, 2020. REUTERS/Bing Guan

Torrey Pines High School graduating student Phoebe Seip, 18 (right), her father Jake, 57, and her sister Sydney, 22, watch former United States President Barack Obama deliver a virtual commencement address to millions of high school seniors who will miss graduation ceremonies due to the coronavirus disease (COVID-19) outbreak, while celebrating Phoebe's canceled prom night at home in San Diego, California, U.S., May 16, 2020. REUTERS/Bing Guan

Torrey Pines High School graduating student Phoebe Seip, 18 (right), and her sister Sydney, 22, watch former United States President Barack Obama deliver a virtual commencement address to millions of high school seniors who will miss graduation ceremonies due to the coronavirus disease (COVID-19) outbreak, while celebrating Phoebe's canceled prom night at home in San Diego, California, U.S., May 16, 2020. REUTERS/Bing Guan

Torrey Pines High School graduating student Phoebe Seip, 18 (center), her father Jake, 57, and her sister Sydney, 22, watch former United States President Barack Obama deliver a virtual commencement address to millions of high school seniors who will miss graduation ceremonies due to the coronavirus disease (COVID-19) outbreak, while celebrating Phoebe’s canceled prom night at home in San Diego, California, U.S., May 16, 2020. REUTERS/Bing Guan

Torrey Pines High School graduating student Phoebe Seip (18, third from left) and family and friends watch former United States President Barack Obama deliver a virtual commencement address to millions of high school seniors who will miss graduation ceremonies due to the coronavirus disease (COVID-19) outbreak, while celebrating Phoebe's canceled prom night at home in San Diego, California, U.S., May 16, 2020. REUTERS/Bing Guan

Torrey Pines High School graduating student Phoebe Seip (18, center), and her sisters Sydney (22, left) and Paisley, 6, watch former U.S. President Barack Obama deliver a virtual commencement address to millions of high school seniors who will miss graduation ceremonies due to the coronavirus disease (COVID-19) outbreak, while celebrating Phoebe's canceled prom night at home in San Diego, California, U.S., May 16, 2020. REUTERS/Bing Guan TPX IMAGES OF THE DAY

Torrey Pines High School graduating student Phoebe Seip watches NBA player LeBron James deliver a virtual commencement address to millions of high school seniors who will miss graduation ceremonies due to the coronavirus disease (COVID-19) outbreak, while celebrating her canceled prom night at home in San Diego, California, U.S., May 16, 2020. REUTERS/Bing Guan

Florida State University student Sydney Seip, 20, and recent United States Air Force Academy graduate Sam Overpeck, 22, watch the "Graduate Together: Class of 2020 High School Commencement" TV special broadcast millions of high school seniors who will miss graduation ceremonies due to the coronavirus disease (COVID-19) outbreak, at home in San Diego, California, U.S., May 16, 2020. REUTERS/Bing Guan

Candelaria Mas Pohmajevic, a graduating Masters student from the Columbia University Graduate School of Architecture, Planning and Preservation (GSAPP) is seen on campus the day before her graduation ceremony, which is to be held online due to the outbreak of the coronavirus disease (COVID-19) in Manhattan, New York City, U.S., May 15, 2020. REUTERS/Andrew Kelly

Graduating Masters Students from the Columbia University Graduate School of Architecture, Planning and Preservation (GSAPP) wave to passing traffic from an overpass the day before their graduation ceremony, which is to be held online due to the outbreak of the coronavirus disease (COVID-19) in Manhattan, New York City, U.S., May 15, 2020. REUTERS/Andrew Kelly

Graduating Masters students from the Columbia University Graduate School of Architecture, Planning and Preservation (GSAPP) gather the day before their graduation ceremony, which is to be held online due to the outbreak of the coronavirus disease (COVID-19) in Manhattan, New York City, U.S., May 15, 2020. REUTERS/Andrew Kelly

Graduating Masters students from the Columbia University Graduate School of Architecture, Planning and Preservation (GSAPP) wave to passing traffic from an overpass the day before their graduation ceremony, which is to be held online due to the outbreak of the coronavirus disease (COVID-19) in Manhattan, New York City, U.S., May 15, 2020. REUTERS/Andrew Kelly

Graduating Masters Students from the Columbia University Graduate School of Architecture, Planning and Preservation (GSAPP) walk on campus where they gathered the day before their graduation ceremony, which is to be held online due to the outbreak of the coronavirus disease (COVID-19) in Manhattan, New York City, U.S., May 15, 2020. REUTERS/Andrew Kelly

Graduating Masters Students from the Columbia University Graduate School of Architecture, Planning and Preservation (GSAPP) gather together the day before their graduation ceremony, which is to be held online due to the outbreak of the coronavirus disease (COVID-19) in Manhattan, New York City, U.S., May 15, 2020. REUTERS/Andrew Kelly

A graduating Masters student from the Columbia University Graduate School of Architecture, Planning and Preservation (GSAPP) stands on campus the day before his graduation ceremony, which is to be held online due to the outbreak of the coronavirus disease (COVID-19) in Manhattan, New York City, U.S., May 15, 2020. REUTERS/Andrew Kelly TPX IMAGES OF THE DAY

Graduating Masters students from the Columbia University Graduate School of Architecture, Planning and Preservation (GSAPP) throw their graduation caps in the air for a photo the day before their graduation ceremony, which is to be held online due to the outbreak of the coronavirus disease (COVID-19) in Manhattan, New York City, U.S., May 15, 2020. REUTERS/Andrew Kelly

Dieudo Muimbe poses for a photograph in his graduation cap and gown one day before the cancelled commencement ceremonies at Salem State University amid the coronavirus disease (COVID-19) outbreak in Salem, Massachusetts, U.S., May 15, 2020. REUTERS/Brian Snyder

Joseph Crowley-Gratton poses for a photograph in his graduation cap and gown one day before the cancelled commencement ceremonies at Salem State University amid the coronavirus disease (COVID-19) outbreak in Salem, Massachusetts, U.S., May 15, 2020. REUTERS/Brian Snyder

Joseph Crowley-Gratton poses for a photograph in his graduation cap and gown one day before the cancelled commencement ceremonies at Salem State University amid the coronavirus disease (COVID-19) outbreak in Salem, Massachusetts, U.S., May 15, 2020. REUTERS/Brian Snyder

Joseph Crowley-Gratton poses for a photograph in his graduation cap and gown one day before the cancelled commencement ceremonies at Salem State University amid the coronavirus disease (COVID-19) outbreak in Salem, Massachusetts, U.S., May 15, 2020. REUTERS/Brian Snyder

Dieudo Muimbe poses for a photograph in his graduation cap and gown one day before the cancelled commencement ceremonies at Salem State University amid the coronavirus disease (COVID-19) outbreak in Salem, Massachusetts, U.S., May 15, 2020. REUTERS/Brian Snyder

Dieudo Muimbe poses for a photograph in his graduation cap and gown one day before the cancelled commencement ceremonies at Salem State University amid the coronavirus disease (COVID-19) outbreak in Salem, Massachusetts, U.S., May 15, 2020. REUTERS/Brian Snyder

Palestinian Hamas police cadets wearing protective face masks take part in a graduation ceremony, amid concerns about the spread of the coronavirus disease (COVID-19) in Gaza City May 7, 2020. REUTERS/Mohammed Salem

Palestinian Hamas police cadets wearing protective face masks take part in a graduation ceremony, amid concerns about the spread of the coronavirus disease (COVID-19) in Gaza City May 7, 2020. REUTERS/Mohammed Salem

A Palestinian Hamas police cadet chants slogans during a graduation ceremony, amid concerns about the spread of the coronavirus disease (COVID-19) in Gaza City May 7, 2020. REUTERS/Mohammed Salem

Palestinian Hamas police cadets grab a person playing the role of a fugitive as they demonstrate their skills during a graduation ceremony, amid concerns about the spread of the coronavirus disease (COVID-19) in Gaza City May 7, 2020. REUTERS/Mohammed Salem

Palestinian Hamas police cadets wearing protective face masks take part in a graduation ceremony, amid concerns about the spread of the coronavirus disease (COVID-19) in Gaza City May 7, 2020. REUTERS/Mohammed Salem

A dog catches a Palestinian Hamas police cadet playing the role of a fugitive during a graduation ceremony, amid concerns about the spread of the coronavirus disease (COVID-19) in Gaza City May 7, 2020. REUTERS/Mohammed Salem

A dog reacts as a Palestinian Hamas police cadet throws a sound grenade during a graduation ceremony, amid concerns about the spread of the coronavirus disease (COVID-19) in Gaza City May 7, 2020. REUTERS/Mohammed Salem

A Palestinian Hamas police cadet throws a sound grenade as he demonstrates his skills with his colleagues during a graduation ceremony, amid concerns about the spread of the coronavirus disease (COVID-19) in Gaza City May 7, 2020. REUTERS/Mohammed Salem TPX IMAGES OF THE DAY

Palestinian Hamas police cadets rappel down a building during a graduation ceremony, amid concerns about the spread of the coronavirus disease (COVID-19) in Gaza City May 7, 2020. REUTERS/Mohammed Salem

A Palestinian Hamas police cadet fires a weapon as he demonstrates his skills during a graduation ceremony, amid concerns about the spread of the coronavirus disease (COVID-19) in Gaza City May 7, 2020. REUTERS/Mohammed Salem

The Ohio State University?s College of Nursing Dean, Bernadette Melnyk, addresses graduates during an online commencement ceremony amid the coronavirus disease (COVID-19) outbreak, in Columbus, Ohio, U.S., May 2, 2020. Picture taken May 2, 2020. REUTERS/Megan Jelinger

Alexis Lamoreaux goes to her hospital shift after graduating from the nursing school of the Ohio State University during an online commencement ceremony amid the coronavirus disease (COVID-19) outbreak, in Columbus, Ohio, U.S., May 4, 2020. REUTERS/Megan Jelinger

Alexis Lamoreaux hugs her father as she graduates from the nursing school of the Ohio State University during an online commencement ceremony amid the coronavirus disease (COVID-19) outbreak, in Columbus, Ohio, U.S., May 2, 2020. Picture taken May 2, 2020. REUTERS/Megan Jelinger

Alexis Lamoreaux watches the screen with her family as she graduates from the nursing school of the Ohio State University during an online commencement ceremony amid the coronavirus disease (COVID-19) outbreak, in Columbus, Ohio, U.S., May 2, 2020. Picture taken May 2, 2020. REUTERS/Megan Jelinger

Alexis Lamoreaux goes to her hospital shift after graduating from the nursing school of the Ohio State University during an online commencement ceremony amid the coronavirus disease (COVID-19) outbreak, in Columbus, Ohio, U.S., May 4, 2020. REUTERS/Megan Jelinger

Alexis Lamoreaux celebrates with her family after she graduates from the nursing school of the Ohio State University during an online commencement ceremony amid the coronavirus disease (COVID-19) outbreak, in Columbus, Ohio, U.S., May 2, 2020. Picture taken May 2, 2020. REUTERS/Megan Jelinger TPX IMAGES OF THE DAY

Alexis Lamoreaux goes to her hospital shift after graduating from the nursing school of the Ohio State University during an online commencement ceremony amid the coronavirus disease (COVID-19) outbreak, in Columbus, Ohio, U.S., May 4, 2020. REUTERS/Megan Jelinger REFILE - CORRECTING DATE

Alexis Lamoreaux goes to her hospital shift after graduating from the nursing school of the Ohio State University during an online commencement ceremony amid the coronavirus disease (COVID-19) outbreak, in Columbus, Ohio, U.S., May 4, 2020. REUTERS/Megan Jelinger REFILE - CORRECTING DATE

Alexis Lamoreaux poses for a picture as she graduates from the nursing school of the Ohio State University during an online commencement ceremony amid the coronavirus disease (COVID-19) outbreak, in Columbus, Ohio, U.S., May 2, 2020. Picture taken May 2, 2020. REUTERS/Megan Jelinger

Alexis Lamoreaux watches the screen as she graduates from the nursing school of the Ohio State University during an online commencement ceremony amid the coronavirus disease (COVID-19) outbreak, in Columbus, Ohio, U.S., May 2, 2020. Picture taken May 2, 2020. REUTERS/Megan Jelinger

Alexis Lamoreaux poses for pictures as she graduates from the nursing school of the Ohio State University during an online commencement ceremony amid the coronavirus disease (COVID-19) outbreak, in Columbus, Ohio, U.S., May 2, 2020. Picture taken May 2, 2020. REUTERS/Megan Jelinger

A Palestinian graduate student poses for a photo as she wears a face mask to protect herself against the coronavirus disease (COVID-19) during her graduation ceremony in the southern Gaza Strip April 16, 2020. Picture taken April 16, 2020. REUTERS/Ibraheem Abu Mustafa

A student helps other to get ready to pick up their doctor's titles at El Salvador National University (UES) after the graduation ceremony was suspended during a quarantine throughout the country, as the government undertakes steadily stricter measures to prevent the spread of the coronavirus disease (COVID-19), in San Salvador, El Salvador April 6, 2020. REUTERS/Jose Cabezas

Students pose for a graduate picture after they picked up their doctor's titles at El Salvador National University (UES) as the graduation ceremony was suspended during a quarantine throughout the country, as the government undertakes steadily stricter measures to prevent the spread of the coronavirus disease (COVID-19), in San Salvador, El Salvador April 6, 2020. REUTERS/Jose Cabezas

A student picks up his doctor's title at El Salvador National University (UES) after the graduation ceremony was suspended during a quarantine throughout the country, as the government undertakes steadily stricter measures to prevent the spread of the coronavirus disease (COVID-19), in San Salvador, El Salvador April 6, 2020. REUTERS/Jose Cabezas

Students greet each other as they pick up their doctor's titles at El Salvador National University (UES) after the graduation ceremony was suspended during a quarantine throughout the country, as the government undertakes steadily stricter measures to prevent the spread of the coronavirus disease (COVID-19), in San Salvador, El Salvador April 6, 2020. REUTERS/Jose Cabezas

Japan's Princess Aiko, daughter of Emperor Naruhito and Empress Masako, wearing a protective face mask following an outbreak of the coronavirus disease (COVID-19), attends her graduation ceremony at Gakushuin Girls' Senior High School in Tokyo, Japan March 22, 2020. REUTERS/Issei Kato/Pool

Japan's Princess Aiko, daughter of Emperor Naruhito and Empress Masako, wearing a protective face mask following an outbreak of the coronavirus disease (COVID-19), attends her graduation ceremony at Gakushuin Girls' Senior High School in Tokyo, Japan March 22, 2020. REUTERS/Issei Kato/Pool

Japan's Princess Aiko, daughter of Emperor Naruhito and Empress Masako, wearing a protective face mask following an outbreak of the coronavirus disease (COVID-19), attends her graduation ceremony at Gakushuin Girls' Senior High School in Tokyo, Japan March 22, 2020. REUTERS/Issei Kato/Pool

Japan's Princess Aiko, daughter of Emperor Naruhito and Empress Masako, wearing a protective face mask following an outbreak of the coronavirus disease (COVID-19), arrives at her graduation ceremony at Gakushuin Girls' Senior High School in Tokyo, Japan March 22, 2020. REUTERS/Issei Kato/Pool

Japan's Princess Aiko, daughter of Emperor Naruhito and Empress Masako, wearing a protective face mask following an outbreak of the coronavirus disease (COVID-19), bows to well-wishers as she attends her graduation ceremony at Gakushuin Girls' Senior High School in Tokyo, Japan March 22, 2020. REUTERS/Issei Kato/Pool REFILE - CORRECTING DATE

Japan's Princess Aiko, daughter of Emperor Naruhito and Empress Masako, wearing a protective face mask following an outbreak of the coronavirus disease (COVID-19), attends her graduation ceremony at Gakushuin Girls' Senior High School in Tokyo, Japan March 22, 2020. REUTERS/Issei Kato/Pool REFILE - CORRECTING DATE

Japan's Princess Aiko, daughter of Emperor Naruhito and Empress Masako, wearing a protective face mask following an outbreak of the coronavirus disease (COVID-19), waves to well-wishers as she attends her graduation ceremony at Gakushuin Girls' Senior High School in Tokyo, Japan March 22, 2020. REUTERS/Issei Kato/Pool REFILE - CORRECTING DATE TPX IMAGES OF THE DAY

A graduate walks up to receive his diploma from U.S. President Donald Trump at the Hope for Prisoners Graduation Ceremony attended in Las Vegas, Nevada, February 20, 2020. REUTERS/ Kevin Lamarque

A graduate reacts after U.S. President Donald Trump handed him his diploma at the Hope for Prisoners Graduation Ceremony attended in Las Vegas, Nevada, February 20, 2020. REUTERS/ Kevin Lamarque