Scooter riders pass the Smithsonian museums, closed to tourists during the coronavirus disease (COVID-19) outbreak in Washington, U.S., May 22, 2020. Picture taken May 22, 2020. REUTERS/Jonathan Ernst

Scooter riders pass a construction zone at the Smithsonian museums, closed to tourists during the coronavirus disease (COVID-19) outbreak in Washington, U.S., May 22, 2020. Picture taken May 22, 2020. REUTERS/Jonathan Ernst

A view shows the horses of the Smithsonian Carousel, closed to tourists during the coronavirus disease (COVID-19) outbreak in Washington, U.S., May 22, 2020. Picture taken May 22, 2020. REUTERS/Jonathan Ernst

A view shows the horses of the Smithsonian Carousel, closed to tourists during the coronavirus disease (COVID-19) outbreak in Washington, U.S., May 22, 2020. Picture taken May 22, 2020. REUTERS/Jonathan Ernst

A view shows the horses of the Smithsonian Carousel, closed to tourists during the coronavirus disease (COVID-19) outbreak in Washington, U.S., May 22, 2020. Picture taken May 22, 2020. REUTERS/Jonathan Ernst

The horses of the Smithsonian Carousel, closed to tourists during the coronavirus disease (COVID-19) outbreak in Washington, U.S., May 22, 2020. Picture taken May 22, 2020. REUTERS/Jonathan Ernst

A closure note due to coronavirus disease (COVID-19) is seen at the entrance to the Washington Monument in Washington, U.S., March 14, 2020. REUTERS/Yuri Gripas

A closure note due to coronavirus disease (COVID-19) is seen at the entrance to the Washington Monument in Washington, U.S., March 14, 2020. REUTERS/Yuri Gripas

A closure note due to coronavirus disease (COVID-19) is seen at a ticket office to visit the Washington Monument in Washington, U.S., March 14, 2020. REUTERS/Yuri Gripas

Closure notes due to coronavirus disease (COVID-19) are seen at the National Museum of American History in Washington, U.S., March 14, 2020. REUTERS/Yuri Gripas

A closure note due to coronavirus disease (COVID-19) is seen at the National Museum of American History in Washington, U.S., March 14, 2020. REUTERS/Yuri Gripas

U.S. National Park Service ranger stands next to a closure note due to coronavirus disease (COVID-19) at the Washington Monument in Washington, U.S., March 14, 2020. REUTERS/Yuri Gripas

62nd Grammy Awards - Show - Los Angeles, California, U.S., January 26, 2020 - Jeff Place & Robert Santelli, compilation producers and Pete Reiniger, mastering engineer, accept the award for Best Historical Album for "Pete Seeger: The Smithsonian Folkways Collection." REUTERS/Mario Anzuoni

People enter the Smithsonian subway station by the National Mall in Washington, U.S., November 22, 2019. REUTERS/Loren Elliott

Bei Bei, the giant panda, is seen for the last time at the Smithsonian National Zoo, before his departure to China, in Washington, U.S., November 19, 2019. REUTERS/Yara Nardi

Bei Bei, the giant panda, is seen for the last time at the Smithsonian National Zoo, before his departure to China, in Washington, U.S., November 19, 2019. REUTERS/Yara Nardi

Bei Bei, the giant panda, is seen for the last time at the Smithsonian National Zoo, before his departure to China, in Washington, U.S., November 19, 2019. REUTERS/Yara Nardi

Bei Bei, the giant panda, is seen for the last time at the Smithsonian National Zoo, before his departure to China, in Washington, U.S., November 19, 2019. REUTERS/Yara Nardi

Bei Bei, the giant panda, is seen for the last time at the Smithsonian National Zoo, before his departure to China, in Washington, U.S., November 19, 2019. REUTERS/Yara Nardi

Bei Bei, the giant panda, is seen for the last time at the Smithsonian National Zoo, before his departure to China, in Washington, U.S., November 19, 2019. REUTERS/Yara Nardi

Bei Bei, the giant panda, is seen for the last time at the Smithsonian National Zoo, before his departure to China, in Washington, U.S., November 19, 2019. REUTERS/Yara Nardi

Bei Bei, the giant panda, is seen for the last time at the Smithsonian National Zoo, before his departure to China, in Washington, U.S., November 19, 2019. REUTERS/Yara Nardi

Workers look at a FedEx's crate where Bei Bei, the giant panda, has been placed before his departure to China, at the Smithsonian National Zoo, in Washington, U.S., November 19, 2019. REUTERS/Yara Nardi

Bei Bei, the giant panda, is seen for the last time at the Smithsonian National Zoo before his departure to China, in Washington, U.S., November 19, 2019. REUTERS/Yara Nardi

Visitors walk past the largest mounted specimen of the African Bush Elephant believed to be the world's largest living land animal, at the Smithsonian National Museum of Natural History in Washignton, November 1, 2019. Picture taken with a slow shutter speed. REUTERS/Siphiwe Sibeko

Kylie Zimmerman from the Smithsonian Institute packs corals delivered to her by Karen Neely, a coral ecologist at Nova Southeastern University, to take back to a lab to study the histology of Stony Tissue Loss Disease (SCTLD) near Key West, Florida, U.S. September 9, 2019. REUTERS/Lucas Jackson SEARCH "JACKSON CORAL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Kylie Zimmerman from the Smithsonian Institute watches as PhD students Bradley Weiler (R) and Anthony Bonacolta take samples to study from corals afflicted by Stony Tissue Loss Disease (SCTLD) near Key West, Florida, U.S. September 9, 2019. REUTERS/Lucas Jackson SEARCH "JACKSON CORAL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

U.S. President Donald Trump, Dutch art collector Bert Kreuk, Netherlands' Prime Minister Mark Rutte and Smithsonian Secretary Lonnie Bunch look at a flag that flew on the first U.S. invading ship on D-Day during a White House ceremony after it was donated by Kreuk to the Smithsonian National Museum of American History in Washington, U.S., July 18, 2019. REUTERS/Kevin Lamarque

U.S. President Donald Trump, Dutch flag donor Bert Kreuk and Netherlands Prime Minister Mark Rutte look at a flag that flew on the first U.S. invading ship on D-Day during a White House ceremony, after it was donated by Kreuk to the Smithsonian National Museum of American History in Washington, U.S., July 18, 2019. REUTERS/Kevin Lamarque

U.S. Vice President Mike Pence poses for a selfie as World War II veterans stand beside a flag that flew on the first U.S. invading ship on D-Day during a White House ceremony, after the flag was donated by a Dutch businessman to the Smithsonian National Museum of American History in Washington, U.S., July 18, 2019. REUTERS/Kevin Lamarque

Neil Armstrong's pressure suit that he wore to walk on the moon during the Apollo 11 mission on July 20, 1969 is seen at the Smithsonian's Air and Space Museum's Udvar-Hazy Center in Chantilly, Virginia, U.S., June 26, 2019. Picture taken June 26, 2019. REUTERS/Kevin Fogarty

Neil Armstrong's pressure suit that he wore to walk on the moon during the Apollo 11 mission on July 20, 1969 is seen at the Smithsonian's Air and Space Museum's Udvar-Hazy Center in Chantilly, Virginia, U.S., June 26, 2019. Picture taken June 26, 2019. REUTERS/Kevin Fogarty

Lisa Young, objects conservator at the Smithsonian's National Air and Space Museum, makes an adjustment on Neil Armstrong's pressure suit that he wore to walk on the moon during the Apollo 11 mission on July 20, 1969, at the Air and Space Museum's Udvar-Hazy Center in Chantilly, Virginia, U.S., June 26, 2019. Picture taken June 26, 2019. REUTERS/Kevin Fogarty

Neil Armstrong's pressure suit that he wore to walk on the moon during the Apollo 11 mission on July 20, 1969 is seen at the Smithsonian's Air and Space Museum's Udvar-Hazy Center in Chantilly, Virginia, U.S., June 26, 2019. Picture taken June 26, 2019. REUTERS/Kevin Fogarty

Lisa Young, objects conservator at the Smithsonian's National Air and Space Museum, makes an adjustment on Neil Armstrong's pressure suit that he wore to walk on the moon during the Apollo 11 mission on July 20, 1969, at the Air and Space Museum's Udvar-Hazy Center in Chantilly, Virginia, U.S., June 26, 2019. Picture taken June 26, 2019. REUTERS/Kevin Fogarty

A Tyrannosaurus Rex skeleton is seen during a media preview for the reopening of the Smithsonian’s Natural History Museum dinosaur and fossil hall after undergoing $110-million renovation in Washington, U.S., June 4, 2019. REUTERS/Kevin Lamarque

An Tyrannosaurus Rex skeleton is seen during a media preview for the reopening of the Smithsonian’s Natural History Museum dinosaur and fossil hall after undergoing $110-million renovation in Washington, U.S., June 4, 2019. REUTERS/Kevin Lamarque

Journalists meander during a media preview for the reopening of the Smithsonian’s Natural History Museum dinosaur and fossil hall after undergoing $110-million renovation in Washington, U.S., June 4, 2019. REUTERS/Kevin Lamarque

A journalist views an exhibit during a media preview for the reopening of the Smithsonian’s Natural History Museum dinosaur and fossil hall after undergoing $110-million renovation in Washington, U.S., June 4, 2019. REUTERS/Kevin Lamarque

A journalist passes an exhibit during a media preview for the reopening of the Smithsonian’s Natural History Museum dinosaur and fossil hall after undergoing $110-million renovation in Washington, U.S., June 4, 2019. REUTERS/Kevin Lamarque

A journalist views an exhibit during a media preview for the reopening of the Smithsonian’s Natural History Museum dinosaur and fossil hall after undergoing $110-million renovation in Washington, U.S., June 4, 2019. REUTERS/Kevin Lamarque

Historian and curator Lonnie Bunch, incoming secretary of the Smithsonian Institution, accepts an Honorary Doctor of Laws degree during the 368th Commencement Exercises at Harvard University in Cambridge, Massachusetts, U.S., May 30, 2019. REUTERS/Brian Snyder

Historian and curator Lonnie Bunch, incoming secretary of the Smithsonian Institution, accepts an Honorary Doctor of Laws degree during the 368th Commencement Exercises at Harvard University in Cambridge, Massachusetts, U.S., May 30, 2019. REUTERS/Brian Snyder

Historian and curator Lonnie Bunch, incoming secretary of the Smithsonian Institution, listens as he is introduced to receive an Honorary Doctor of Laws degree during the 368th Commencement Exercises at Harvard University in Cambridge, Massachusetts, U.S., May 30, 2019. REUTERS/Brian Snyder

Baritone Davone Tines performs for honorary degree recipient Lonnie Bunch, incoming secretary of the Smithsonian Institution, during the 368th Commencement Exercises at Harvard University in Cambridge, Massachusetts, U.S., May 30, 2019. REUTERS/Brian Snyder

A woman holds an umbrella against the rain in the garden of the Smithsonian Institution Castle in Washington, U.S., May 13, 2019. REUTERS/Kevin Lamarque

A woman holds an umbrella against the rain while walking through the garden of the Smithsonian Institution Castle in Washington, U.S., May 13, 2019. REUTERS/Kevin Lamarque

A employee arrives for work at the National Museum of the American Indian - Smithsonian Institution, after the U.S. government reopened with about 800,000 federal workers returning to work after a 35-day shutdown, in New York, U.S., January 29, 2019. REUTERS/Brendan McDermid

Tourists walk pass the Smithsonian museums sings on National Mall in Washington, U.S., before it will be reopen next week after partial government shutdown, January 27, 2019. REUTERS/Yuri Gripas

People ride on scooters outside the Smithsonian Air and Space Museum in Washington, U.S., before it will be reopen next week after partial government shutdown, January 27, 2019. REUTERS/Yuri Gripas

A sign outside of the Renwick Gallery stating that all Smithsonian museums are closed is seen on day 30 of a partial government shutdown, in Washington, U.S., January 20, 2019. REUTERS/Al Drago

A sign outside of the Renwick Gallery stating that all Smithsonian museums are closed is seen on day 30 of a partial government shutdown, in Washington, U.S., January 20, 2019. REUTERS/Al Drago

A sign outside of the Renwick Gallery stating that all Smithsonian museums are closed is seen on day 30 of a partial government shutdown, in Washington, U.S., January 20, 2019. REUTERS/Al Drago

With the Smithsonian museums closed due to the partial government shutdown and a sudden cold snap, a woman jogs on the empty National Mall in Washington, U.S., January 10, 2019. REUTERS/Kevin Lamarque

The entrance to the Smithsonian's National Gallery of Art is padlocked as a partial government shutdown continues, in Washington, U.S., January 7, 2019. REUTERS/Jim Young

The entrance to the Smithsonian's Enid A. Haupt Garden is padlocked as a partial government shutdown continues, in Washington, U.S., January 7, 2019. REUTERS/Jim Young

A woman takes a photo of a sign that informs visitors the Smithsonian Institution's National Museum of the American Indian is closed due to the government shutdown in New York City, New York, U.S., January 3, 2019. REUTERS/Shannon Stapleton

A sign informs visitors that the Smithsonian Institution's National Museum of the American Indian is closed due to the government shutdown in New York City, New York, U.S., January 3, 2019. REUTERS/Shannon Stapleton

A boy views the flag known as "The Star Spangled Banner" the day before the midterm election, at the Smithsonian Museum of American History in Washington, U.S. November 5, 2018. The flag flew over Fort McHenry in the War of 1812 and inspired a poem by Francis Scott Key, which became the U.S. national anthem. REUTERS/Chris Helgren

A boy views the flag known as "The Star Spangled Banner" the day before the midterm election, at the Smithsonian Museum of American History in Washington, U.S. November 5, 2018. The flag flew over Fort McHenry in the War of 1812 and inspired a poem by Francis Scott Key, which became the U.S. national anthem. REUTERS/Chris Helgren