U.S. Army General Gustave Perna testifies before the Senate Armed Services Committee during his confirmation hearing to co-lead Operation Warp Speed, an effort to find a vaccine for the coronavirus disease (COVID-19), in the Dirksen Senate Office Building on Capitol Hill, in Washington, U.S. June 18, 2020. Chip Somodeville/Pool via REUTERS 

U.S. Army General Gustave Perna testifies before the Senate Armed Services Committee during his confirmation hearing to co-lead Operation Warp Speed, an effort to find a vaccine for the coronavirus disease (COVID-19), in the Dirksen Senate Office Building on Capitol Hill, in Washington, U.S. June 18, 2020. Chip Somodeville/Pool via REUTERS 

U.S. Army General Gustave Perna testifies before the Senate Armed Services Committee during his confirmation hearing to co-lead Operation Warp Speed, an effort to find a vaccine for the coronavirus disease (COVID-19), in the Dirksen Senate Office Building on Capitol Hill, in Washington, U.S. June 18, 2020. Chip Somodeville/Pool via REUTERS 

Sen. Doug Jones (D-AL) talks with U.S. Army General Gustave F. Perna during his confirmation hearing to co-lead Operation Warp Speed, an effort to find a vaccine for the coronavirus disease (COVID-19), before the Senate Armed Services Committee in the Dirksen Senate Office Building on Capitol Hill, in Washington, U.S. June 18, 2020. Chip Somodeville/Pool via REUTERS 

U.S. Army General Gustave Perna wears a protective face mask as he prepares to testify before the Senate Armed Services Committee during his confirmation hearing to co-lead Operation Warp Speed, an effort to find a vaccine for the coronavirus disease (COVID-19), in the Dirksen Senate Office Building on Capitol Hill, in Washington, U.S. June 18, 2020. Chip Somodeville/Pool via REUTERS 

U.S. Army General Gustave Perna testifies before the Senate Armed Services Committee during his confirmation hearing to co-lead Operation Warp Speed, an effort to find a vaccine for the coronavirus disease (COVID-19), in the Dirksen Senate Office Building on Capitol Hill, in Washington, U.S. June 18, 2020. Chip Somodeville/Pool via REUTERS 

U.S. Army General Gustave Perna testifies before the Senate Armed Services Committee during his confirmation hearing to co-lead Operation Warp Speed, an effort to find a vaccine for the coronavirus disease (COVID-19), in the Dirksen Senate Office Building on Capitol Hill, in Washington, U.S. June 18, 2020. Chip Somodeville/Pool via REUTERS 

U.S. Army General Gustave Perna testifies before the Senate Armed Services Committee during his confirmation hearing to co-lead Operation Warp Speed, an effort to find a vaccine for the coronavirus disease (COVID-19), in the Dirksen Senate Office Building on Capitol Hill, in Washington, U.S. June 18, 2020. Chip Somodeville/Pool via REUTERS 

U.S. Army General Gustave Perna testifies before the Senate Armed Services Committee during his confirmation hearing to co-lead Operation Warp Speed, an effort to find a vaccine for the coronavirus disease (COVID-19), in the Dirksen Senate Office Building on Capitol Hill, in Washington, U.S. June 18, 2020. Chip Somodeville/Pool via REUTERS 

U.S. Army General Gustave Perna testifies before the Senate Armed Services Committee during his confirmation hearing to co-lead Operation Warp Speed, an effort to find a vaccine for the coronavirus disease (COVID-19), in the Dirksen Senate Office Building on Capitol Hill, in Washington, U.S. June 18, 2020. Chip Somodeville/Pool via REUTERS 

U.S. Army General Gustave Perna testifies before the Senate Armed Services Committee during his confirmation hearing to co-lead Operation Warp Speed, an effort to find a vaccine for the coronavirus disease (COVID-19), in the Dirksen Senate Office Building on Capitol Hill, in Washington, U.S. June 18, 2020. Chip Somodeville/Pool via REUTERS 

U.S. Army General Gustave Perna testifies before the Senate Armed Services Committee during his confirmation hearing to co-lead Operation Warp Speed, an effort to find a vaccine for the coronavirus disease (COVID-19), in the Dirksen Senate Office Building on Capitol Hill, in Washington, U.S. June 18, 2020. Chip Somodeville/Pool via REUTERS 

War propoganda and Socialist posters are seen in the Montmartre district in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) spread in France, March 25, 2020. The coronavirus lockdown has left one Parisian street stuck in a time warp after the makers of a film set during World War 2 were forced to abandon their set. REUTERS/Charles Platiau 

A local resident looks at War propoganda posters in the Montmartre district in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) spread in France, March 25, 2020. The coronavirus lockdown has left one Parisian street stuck in a time warp after the makers of a film set during World War 2 were forced to abandon their set. REUTERS/Charles Platiau 

Local residents, wearing protective face masks, walk past War propoganda posters in the Montmartre district in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) spread in France, March 25, 2020. The coronavirus lockdown has left one Parisian street stuck in a time warp after the makers of a film set during World War 2 were forced to abandon their set. REUTERS/Charles Platiau 

A local resident runs past War propoganda posters in the Montmartre district in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) spread in France, March 25, 2020. The coronavirus lockdown has left one Parisian street stuck in a time warp after the makers of a film set during World War 2 were forced to abandon their set. REUTERS/Charles Platiau 

French police, patrolling in a street, look at mock stores in the Montmartre district in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) spread in France, March 25, 2020. The coronavirus lockdown has left one Parisian street stuck in a time warp after the makers of a film set during World War 2 were forced to abandon their set. REUTERS/Charles Platiau 

A local resident walks her dogs past War propoganda posters in the Montmarte district in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) spread in France, March 25, 2020. The coronavirus lockdown has left one Parisian street stuck in a time warp after the makers of a film set during World War 2 were forced to abandon their set. REUTERS/Charles Platiau 

A local resident takes pictures of War propoganda posters in the Montmartre district in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) spread in France, March 25, 2020. The coronavirus lockdown has left one Parisian street stuck in a time warp after the makers of a film set during World War 2 were forced to abandon their set. REUTERS/Charles Platiau 

Local residents, wearing protective face masks, take picture of mock stores in the Montmartre district in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) spread in France, March 25, 2020. The coronavirus lockdown has left one Parisian street stuck in a time warp after the makers of a film set during World War 2 were forced to abandon their set. REUTERS/Charles Platiau 

A local resident, wearing a protective face mask, walks past by mock stores in the Montmartre district in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) spread in France, March 25, 2020. The coronavirus lockdown has left one Parisian street stuck in a time warp after the makers of a film set during World War 2 were forced to abandon their set. REUTERS/Charles Platiau 

Priests attend a vigil led by Pope Francis ahead of Pentecost Sunday at the Vatican, June 8, 2019. Picture taken with zoom burst. REUTERS/Remo Casilli 

Soccer Football - Premier League - Brighton & Hove Albion v Manchester City - The American Express Community Stadium, Brighton, Britain - May 12, 2019 Manchester City's Bernardo Silva is warpped in confetti as he celebrates winning the Premier League REUTERS/Toby Melville EDITORIAL USE ONLY. No use with unauthorized audio, video, data, fixture lists, club/league logos or "live" services. Online in-match use limited to 75 images, no video emulation. No use in betting, games or single club/league/player publications. Please contact your account representative for further details. 

Cannabis plants grow inside the Tilray factory hothouse in Cantanhede, Portugal April 24, 2019. Picture taken with a zoom burst. REUTERS/Rafael Marchante 

A person is seen in Orient Station terminal, in Lisbon, Portugal, February 28, 2019. Picture taken February 28, 2019. REUTERS/Pedro Nunes 

A firefighter drops water in the aftermath of the fire on the road between Monchique and Silves, Portugal August 9, 2018. Picture taken with a zoom burst technique. REUTERS/Pedro Nunes 

Bobbins of yarn are positioned onto a warping machine at the Reda wool mill factory in Valle Mosso near Biella, northern Italy, December 1, 2016. Picture taken December 1, 2016. REUTERS/Giulia Segreti 

Different threads of yarn are pulled together by a machine to make what is called a warp at the Tollegno 1900 factory near Biella, northern Italy, December 1, 2016. Picture taken December 1, 2016. REUTERS/Giulia Segreti 

Britain Tennis - Barclays ATP World Tour Finals - O2 Arena, London - 17/11/16 General view during the match between Belgium's David Goffin and Serbia's Novak Djokovic Action Images via Reuters / Tony O'Brien Livepic EDITORIAL USE ONLY. 

A long exposure photograph shows star trails in the night sky over a camp in Altyn-Emel national park, in Almaty region, Kazakhstan, May 13, 2016. REUTERS/Shamil Zhumatov SEARCH "SINGING SANDS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY 

The Eiffel Tower is illuminated in memory of the victims of the gay nightclub mass shooting in Orlando, in Paris, France, June 13, 2016. Picture taken with long exposure and a zoom lens. REUTERS/Gonzalo Fuentes TPX IMAGES OF THE DAY

Football Soccer - France v Romania - EURO 2016 - Group A - Stade de France, Saint-Denis near Paris, France - 10/6/16
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Muslims pray at the Grand Mosque during the holy fasting month of Ramadan in Mecca, Saudi Arabia, June 8, 2016. Picture taken with zoom-burst effect. REUTERS/Faisal Al Nasser

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A man is reflected in a warped mirror in a corridor of an office building in Tokyo, Japan February 16, 2016. REUTERS/Thomas Peter 

A zoomed image of the Telekom Austria Group logo is seen during a news conference at the company's headquarters in this picture illustration taken February 10, 2016. REUTERS/Heinz-Peter Bader

Darts - 2016 World Professional Darts Championships - Lakeside Country Club, Frimley Green, Surrey - 6/1/16
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Indian police personnel rehearse for the Republic Day parade on a foggy winter morning in New Delhi, India, January 6, 2016. India will celebrate its annual Republic Day on January 26. REUTERS/Adnan Abidi 

German Chancellor Angela Merkel attends a reception for Sternsinger (carol singers) at the Chancellery in Berlin, Germany, January 5, 2016. Merkel annually receives children who take part in the Sternsinger project, collecting money for charity programs that help children in need around the world. REUTERS/Hannibal Hanschke

Cypriot President Nicos Anastasiades (R) and Austrian President Heinz Fischer walk outside the Presidential Palace in Nicosia, Cyprus, November 3, 2015. REUTERS/Yiannis Kourtoglou 

Team members work on the Mercedes Formula One car of Lewis Hamilton of Britain in pit lane at the Marina Bay street circuit ahead of the first practice session of the Singapore F1 Grand Prix September 18, 2015. REUTERS/Edgar Su 

Traffic is reflected in a car mirror as heavy rain falls in San Juan Capistrano, California September 15, 2015. REUTERS/Mike Blake 

Yamaha MotoGP rider Valentino Rossi of Italy leaves the pit during the third free practice session of the San Marino Grand Prix in Misano Adriatico circuit in central Italy, September 12, 2015. REUTERS/Max Rossi

A man is reflected in a warped mirror as he sits on a bench in front of the headquarters of Toshiba Corp in Tokyo in this August 13, 2015 picture. To match Insight TOSHIBA-ACCOUNTING/NISHIDA REUTERS/Thomas Peter 

A zoomed image shows the logo of UniCredit unit Bank Austria during a news conference in Vienna, Austria, August 6, 2015. Bank Austria's first-half net profit dropped around 37 percent to 489 million euros ($534 million) as losses in its Ukraine business, risk provisions and bank levies weighed on results. The central and Eastern Europe (CEE) arm of UniCredit said its Ukraine subsidiary, which it is in discussions to sell, reported a 202 million euro loss. REUTERS/Heinz-Peter Bader 

A Maiko, an apprentice geisha, is reflected in a warped mirror as she performs a traditional dance in front of a tank with goldfish at the Art Aquarium exhibition in Tokyo July 27, 2015. Several thousand goldfish are displayed in dozens of uniquely shaped tanks, using LED lights, projection mapping and music in a show that was produced by Japanese designer Hidetomo Kimura. Picture taken July 27, 2015. REUTERS/Thomas Peter 

A woman looks at goldfish through the warped wall of a fish tank at the Art Aquarium exhibition in Tokyo July 10, 2015. Several thousand goldfish are displayed in dozens of uniquely shaped tanks, using LED lights, projection mapping and music in a show that was produced by Japanese designer Hidetomo Kimura. REUTERS/Thomas Peter

A woman looks at goldfish through the warped wall of a fish tank at the Art Aquarium exhibition in Tokyo July 10, 2015. Several thousand goldfish are displayed in dozens of uniquely shaped tanks, using LED lights, projection mapping and music in a show that was produced by Japanese designer Hidetomo Kimura. REUTERS/Thomas Peter

Goldfish are pictured through the warped wall of a fish tank at the Art Aquarium exhibition in Tokyo July 10, 2015. Several thousand goldfish are displayed in dozens of uniquely shaped tanks, using LED lights, projection mapping and music in a show that was produced by Japanese designer Hidetomo Kimura. REUTERS/Thomas Peter

A woman looks at goldfish through the warped wall of a fish tank at the Art Aquarium exhibition in Tokyo July 10, 2015. Several thousand goldfish are displayed in dozens of uniquely shaped tanks, using LED lights, projection mapping and music in a show that was produced by Japanese designer Hidetomo Kimura. REUTERS/Thomas Peter

A woman looks at goldfish through the warped wall of a fish tank at the Art Aquarium exhibition in Tokyo July 10, 2015. Several thousand goldfish are displayed in dozens of uniquely shaped tanks, using LED lights, projection mapping and music in a show that was produced by Japanese designer Hidetomo Kimura. REUTERS/Thomas Peter

Women wearing kimonos look at goldfish in an illuminated tank at the Art Aquarium exhibition in Tokyo July 10, 2015. Several thousand goldfish are displayed in dozens of uniquely shaped tanks, using LED lights, projection mapping and music in a show that was produced by Japanese designer Hidetomo Kimura. REUTERS/Thomas Peter

Campaign posters for Tony Williams, a Philadelphia mayoral candidate, are seen outside of the Summit Presbyterian Church in Philadelphia, Pennsylvania on May 19, 2015. Campaign finance watchdog groups fear heavy spending by ultra-rich Americans will warp the election - already expected to be the most money-soaked in history - and prop up candidates who don't represent the will of the majority.REUTERS/Mark Makela 

West Philadelphians casts their votes in a recreation center during the special primary election in Philadelphia, Pennsylvania on May 19, 2015. Campaign finance watchdog groups fear heavy spending by ultra-rich Americans will warp the election - already expected to be the most money-soaked in history - and prop up candidates who don't represent the will of the majority. Photo taken May 19, 2015. REUTERS/Mark Makela 

A man sits outside a voting station at a West Philadelphia recreation center during the special primary election in Philadelphia, Pennsylvania on May 19, 2015. Campaign finance watchdog groups fear heavy spending by ultra-rich Americans will warp the election - already expected to be the most money-soaked in history - and prop up candidates who don't represent the will of the majority. Photo taken May 19, 2015. REUTERS/Mark Makela 

Jim Kenney greets supporters after winning the Democratic primary for Mayor of Philadelphia during his election night party at Vie in Philadelphia, Pennsylvania on May 19, 2015. Campaign finance watchdog groups fear heavy spending by ultra-rich Americans will warp the election - already expected to be the most money-soaked in history - and prop up candidates who don't represent the will of the majority. Photo taken May 19, 2015. REUTERS/Mark Makela 

Denise Carey (L), the Committee Person for the 44th ward, 16th division advises a voter before entering a West Philadelphia recreation center during the special primary election in Philadelphia, Pennsylvania on May 19, 2015. Campaign finance watchdog groups fear heavy spending by these ultra-rich Americans will warp the election - already expected to be the most money-soaked in history - and prop up candidates who don't represent the will of the majority. Photo taken May 19, 2015. REUTERS/Mark Makela 

A t-shirt and campaign poster represent both Philadelphia mayoral candidates Jim Kenney and Tony Williams at Settlementt Music School voting station during a special primary election in Philadelphia, Pennsylvania on May 19, 2015. Campaign finance watchdog groups fear heavy spending by ultra-rich Americans will warp the election - already expected to be the most money-soaked in history - and prop up candidates who don't represent the will of the majority. Photo taken May 19, 2015. REUTERS/Mark Makela 

Supporters celebrate on stage as Jim Kenney was announced as the winner for the Democratic primary for Mayor of Philadelphia at his election night party in Philadelphia, Pennsylvania on May 19, 2015. Campaign finance watchdog groups fear heavy spending by ultra-rich Americans will warp the election - already expected to be the most money-soaked in history - and prop up candidates who don't represent the will of the majority. Photo taken May 19, 2015. REUTERS/Mark Makela 

A woman emerges from a booth after casting her vote at the Heitzman Recreation Center during Primary Special election in Philadelphia, Pennsylvania on May 19, 2015. Campaign finance watchdog groups fear heavy spending by ultra-rich Americans will warp the election - already expected to be the most money-soaked in history - and prop up candidates who don't represent the will of the majority. Photo taken May 19, 2015. REUTERS/Mark Makela