Demonstrators scuffle with police during a protest against a decision by Germany's Constitutional Court that the law called "Mietendeckel" (rent cover) putting a rent cap on apartments in Berlin is invalid, in Berlin, Germany, April 15, 2021. REUTERS/Christian Mang

Demonstrators face off police officers during a protest against a decision by Germany's Constitutional Court that the law called "Mietendeckel" (rent cover) putting a rent cap on apartments in Berlin is invalid, in Berlin, Germany, April 15, 2021. REUTERS/Christian Mang

Dr. David Kessler, Department of Health and Human Services Chief Science Officer for COVID Response, left, listens as Rep. Raja Krishnamoorthi speaks during the House Select Subcommittee on the Coronavirus Crisis hearing on the Capitol Hill in Washington, U.S., April 15, 2021. Amr Alfiky/Pool via REUTERS

Rep. Mariannette Miller-Meeks wears a face mask imprinted with the word "vaccinated" during the House Select Subcommittee on the Coronavirus Crisis hearing on the Capitol Hill in Washington, U.S., April 15, 2021. Amr Alfiky/Pool via REUTERS

Rep. Jim Jordan attends the House Select Subcommittee on the Coronavirus Crisis hearing on the Capitol Hill in Washington, U.S., April 15, 2021. Amr Alfiky/Pool via REUTERS

Rep. Jim Jordan attends the House Select Subcommittee on the Coronavirus Crisis hearing on the Capitol Hill in Washington, U.S., April 15, 2021. Amr Alfiky/Pool via REUTERS

General view of the Passing-out parade at Britannia Royal Naval College during Britain's Prime Minister Boris Johnson's visit in commemoration of Britain's Prince Philip, in Dartmouth, Britain April 15, 2021. The Duke of Edinburgh was a cadet at the naval college when he first met Princess Elizabeth, who later became queen. Finnbarr Webster/Pool via REUTERS

General view of the Passing-out parade at Britannia Royal Naval College during Britain's Prime Minister Boris Johnson's visit in commemoration of Britain's Prince Philip, in Dartmouth, Britain April 15, 2021. The Duke of Edinburgh was a cadet at the naval college when he first met Princess Elizabeth, who later became queen. Finnbarr Webster/Pool via REUTERS

General view of the Passing-out parade at Britannia Royal Naval College during Britain's Prime Minister Boris Johnson's visit in commemoration of Britain's Prince Philip, in Dartmouth, Britain April 15, 2021. The Duke of Edinburgh was a cadet at the naval college when he first met Princess Elizabeth, who later became queen. Finnbarr Webster/Pool via REUTERS

A fisherman is seen on the ice-covered Irtysh River near an oil refinery in Omsk, Russia April 15, 2021. REUTERS/Alexey Malgavko

U.S. Senator Richard Blumenthal (D-CT) speaks with Everytown for Gun Safety President John Feinblatt as they arrive for a news conference at the U.S. Capitol in Washington, U.S. April 15, 2021. REUTERS/Jonathan Ernst

U.S. Senator Richard Blumenthal (D-CT) arrives for a news conference on gun safety at the U.S. Capitol in Washington, U.S. April 15, 2021. REUTERS/Jonathan Ernst

U.S. Senator Susan Collins (R-ME) and Senator Lisa Murkowski (R-AK) arrive for a roll call vote at the U.S. Capitol in Washington, U.S. April 15, 2021. REUTERS/Jonathan Ernst

U.S. Senator Susan Collins (R-ME) and Senator Lisa Murkowski (R-AK), with Senator John Barrasso (R-WY), arrive for a roll call vote at the U.S. Capitol in Washington, U.S. April 15, 2021. REUTERS/Jonathan Ernst

Vehicles with diplomatic license plates sit parked next to the Consulate-General of the Russian Federation in New York City, U.S., April 15, 2021. REUTERS/Shannon Stapleton

Demonstrators scuffle with police during a protest against a decision by Germany's Constitutional Court that the law called "Mietendeckel" (rent cover) putting a rent cap on apartments in Berlin is invalid, in Berlin, Germany, April 15, 2021. REUTERS/Christian Mang

Men stand behind diplomatic vehicles next to the Consulate-General of the Russian Federation in New York City, U.S., April 15, 2021. REUTERS/Shannon Stapleton

A demonstrator scuffles with police during a protest against a decision by Germany's Constitutional Court that the law called "Mietendeckel" (rent cover) putting a rent cap on apartments in Berlin is invalid, in Berlin, Germany, April 15, 2021. REUTERS/Christian Mang

Dr. Rochelle Walensky speaks beforethe House Select Subcommittee on the Coronavirus Crisis on the Capitol Hill in Washington, U.S., April 15, 2021. Amr Alfiky/Pool via REUTERS

The Russian flag flutters on the Consulate-General of the Russian Federation in New York City, U.S., April 15, 2021. REUTERS/Shannon Stapleton

The Russian flag flutters on the Consulate-General of the Russian Federation in New York City, U.S., April 15, 2021. REUTERS/Shannon Stapleton

A demonstrator scuffles with police during a protest against a decision by Germany's Constitutional Court that the law called "Mietendeckel" (rent cover) putting a rent cap on apartments in Berlin is invalid, in Berlin, Germany, April 15, 2021. REUTERS/Christian Mang

Soccer Football - Europa League - Quarter Final Second Leg - AS Roma v Ajax Amsterdam - Stadio Olimpico, Rome, Italy - April 15, 2021 General view inside the stadium before the match REUTERS/Alberto Lingria

U.S. Senator Mitt Romney (R-UT) speaks with a reporter as he arrives for a roll call vote at the U.S. Capitol in Washington, U.S. April 15, 2021. REUTERS/Jonathan Ernst

U.S. Senator Elizabeth Warren (D-MA) arrives for a roll call vote at the U.S. Capitol in Washington, U.S. April 15, 2021. REUTERS/Jonathan Ernst

U.S. Senator John Kennedy (R-LA) speaks with a reporter as he arrives for a roll call vote at the U.S. Capitol in Washington, U.S. April 15, 2021. REUTERS/Jonathan Ernst

Soccer Football - Europa League - Quarter Final Second Leg - AS Roma v Ajax Amsterdam - Stadio Olimpico, Rome, Italy - April 15, 2021 General view inside the stadium before the match REUTERS/Alberto Lingria

U.S. Senator Dick Durbin (D-IL) and Senator Dan Sullivan (R-AK) arrive for a roll call vote at the U.S. Capitol in Washington, U.S. April 15, 2021. REUTERS/Jonathan Ernst

A construction crane is seen above Brookfield's Bay Adelaide North, the third office tower to be constructed at their Bay Adelaide Centre complex property in Toronto, Ontario, Canada April 14, 2021. Picture taken April 14, 2021. REUTERS/Chris Helgren

A construction crane is seen above Brookfield's Bay Adelaide North, the third office tower to be constructed at their Bay Adelaide Centre complex property in Toronto, Ontario, Canada April 14, 2021. Picture taken April 14, 2021. REUTERS/Chris Helgren

A construction crane is seen above Brookfield's Bay Adelaide North, the third office tower to be constructed at their Bay Adelaide Centre complex property in Toronto, Ontario, Canada April 14, 2021. Picture taken April 14, 2021. REUTERS/Chris Helgren

U.S. Rep. Hank Johnson (D-GA), U.S. Senator Ed Markey (D-MA), U.S. Rep. Jerry Nadler (D-NY), U.S. Rep. Mondaire Jones (D-NY) introduce the Judiciary Act of 2021 aimed at expanding the U.S. Supreme Court from nine to thirteen justices outside the court in Washington, D.C., U.S., April 15, 2021. REUTERS/James Lawler Duggan

U.S. Senator Chuck Grassley (R-IA) arrives for a roll call vote at the U.S. Capitol in Washington, U.S. April 15, 2021. REUTERS/Jonathan Ernst

U.S. Senator Lindsey Graham (R-SC) speaks with a reporter as he arrives for a roll call vote at the U.S. Capitol in Washington, U.S. April 15, 2021. REUTERS/Jonathan Ernst

Libya's Prime Minister Abdulhamid Dbeibeh attends a meeting with Russia's Foreign Minister Sergei Lavrov in Moscow, Russia April 15, 2021. Yuri Kochetkov/Pool via REUTERS

Former Minneapolis police officer Derek Chauvin (R) waits during a break on the fourteenth day of his trial of former Minneapolis police officer Derek Chauvin for second-degree murder, third-degree murder and second-degree manslaughter in the death of George Floyd in Minneapolis, Minnesota, U.S. April 15, 2021 in a still image from video. Pool via REUTERS

Former Minneapolis police officer Derek Chauvin waits during a break on the fourteenth day of his trial of former Minneapolis police officer Derek Chauvin for second-degree murder, third-degree murder and second-degree manslaughter in the death of George Floyd in Minneapolis, Minnesota, U.S. April 15, 2021 in a still image from video. Pool via REUTERS

Russia's Foreign Minister Sergei Lavrov attends a meeting with Libya's Prime Minister Abdulhamid Dbeibeh in Moscow, Russia April 15, 2021. Yuri Kochetkov/Pool via REUTERS

U.S. Senator Rand Paul (R-KY) rides an escalator after a roll call vote at the U.S. Capitol in Washington, U.S. April 15, 2021. REUTERS/Jonathan Ernst

U.S. Senator Rand Paul (R-KY) rides an escalator after a roll call vote at the U.S. Capitol in Washington, U.S. April 15, 2021. REUTERS/Jonathan Ernst

Russia's Foreign Minister Sergei Lavrov attends a meeting with Libya's Prime Minister Abdulhamid Dbeibeh in Moscow, Russia April 15, 2021. Yuri Kochetkov/Pool via REUTERS

Soccer Football - Europa League - Quarter Final Second Leg - AS Roma v Ajax Amsterdam - Stadio Olimpico, Rome, Italy - April 15, 2021 General view inside the stadium before the match REUTERS/Alberto Lingria

Soccer Football - Europa League - Quarter Final Second Leg - AS Roma v Ajax Amsterdam - Stadio Olimpico, Rome, Italy - April 15, 2021 General view inside the stadium before the match REUTERS/Alberto Lingria

Russia's Foreign Minister Sergei Lavrov attends a meeting with Libya's Prime Minister Abdulhamid Dbeibeh in Moscow, Russia April 15, 2021. Yuri Kochetkov/Pool via REUTERS

Soccer Football - Europa League - Quarter Final Second Leg - AS Roma v Ajax Amsterdam - Stadio Olimpico, Rome, Italy - April 15, 2021 General view inside the stadium before the match REUTERS/Alberto Lingria

Soccer Football - Europa League - Quarter Final Second Leg - AS Roma v Ajax Amsterdam - Stadio Olimpico, Rome, Italy - April 15, 2021 General view inside the stadium before the match REUTERS/Alberto Lingria

White House Press Secretary Jen Psaki removes her face mask before delivering remarks during a press briefing at the White House in Washington, U.S., April 15, 2021. REUTERS/Tom Brenner

White House Press Secretary Jen Psaki delivers remarks during a press briefing at the White House in Washington, U.S., April 15, 2021. REUTERS/Tom Brenner

White House Press Secretary Jen Psaki delivers remarks during a press briefing at the White House in Washington, U.S., April 15, 2021. REUTERS/Tom Brenner

People protest against a decision by Germany's Constitutional Court that the law called "Mietendeckel" (rent cover) putting a rent cap on apartments in Berlin is invalid, in Berlin, Germany, April 15, 2021. Banner reads: "The rich should pay" REUTERS/Christian Mang

A service member of the Ukrainian armed forces is reflected in a mirror at fighting positions on the line of separation near the rebel-controlled city of Donetsk, Ukraine April 15, 2021. REUTERS/Anastasia Vlasova

Chicago-based breathing expert Dr. Martin Tobin answers questions during the fourteenth day of the trial of former Minneapolis police officer Derek Chauvin for second-degree murder, third-degree murder and second-degree manslaughter in the death of George Floyd in Minneapolis, Minnesota, U.S. April 15, 2021 in a still image from video. Pool via REUTERS

U.S. Rep. Hank Johnson (D-GA), U.S. Senator Ed Markey (D-MA), and U.S. Rep. Jerry Nadler (D-NY), introduce the Judiciary Act of 2021 aimed at expanding the U.S. Supreme Court from nine to thirteen justices outside the court in Washington, U.S., April 15, 2021. REUTERS/James Lawler Duggan

A service member of the Ukrainian armed forces stands guard at fighting positions on the line of separation near the rebel-controlled city of Donetsk, Ukraine April 15, 2021. REUTERS/Anastasia Vlasova

A service member of the Ukrainian armed forces uses a periscope while observing the area at fighting positions on the line of separation near the rebel-controlled city of Donetsk, Ukraine April 15, 2021. REUTERS/Anastasia Vlasova

U.S. Senator Ed Markey (D-MA), U.S. Rep. Jerry Nadler (D-NY), U.S. Rep. Mondaire Jones (D-NY), and U.S. Rep. Hank Johnson (D-GA) huddle before introducing the Judiciary Act of 2021 aimed at expanding the U.S. Supreme Court from nine to thirteen justices outside the court in Washington, D.C., U.S., April 15, 2021. REUTERS/James Lawler Duggan

Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases testifies before the House Select Subcommittee on the Coronavirus Crisis on the Capitol Hill in Washington, U.S., April 15, 2021. Amr Alfiky/Pool via REUTERS

A service member of the Ukrainian armed forces holds a weapon at fighting positions on the line of separation near the rebel-controlled city of Donetsk, Ukraine April 15, 2021. REUTERS/Anastasia Vlasova

People protest against a decision by Germany's Constitutional Court that the law called "Mietendeckel" (rent cover) putting a rent cap on apartments in Berlin is invalid, in Berlin, Germany, April 15, 2021. Banners read "You can get our hate, you won't get our rent" and "The rich should pay" REUTERS/Christian Mang

A patient suffering from the coronavirus disease (COVID-19) gets treatment at the casualty ward in Lok Nayak Jai Prakash (LNJP) hospital, amidst the spread of the disease in New Delhi, India April 15, 2021. REUTERS/Danish Siddiqui

A woman is consoled after her husband died due to the coronavirus disease (COVID-19) outside a mortuary of a COVID-19 hospital in New Delhi, India, April 15, 2021. REUTERS/Danish Siddiqui TPX IMAGES OF THE DAY

A patient suffering from the coronavirus disease (COVID-19) gets treatment at the casualty ward in Lok Nayak Jai Prakash (LNJP) hospital, amidst the spread of the disease in New Delhi, India April 15, 2021. REUTERS/Danish Siddiqui

A patient suffering from the coronavirus disease (COVID-19) is wheeled from the casualty ward in Lok Nayak Jai Prakash (LNJP) hospital, amidst the spread of the disease in New Delhi, India April 15, 2021. REUTERS/Danish Siddiqui

A patient suffering from the coronavirus disease (COVID-19) gets treatment at the casualty ward in Lok Nayak Jai Prakash (LNJP) hospital, amidst the spread of the disease in New Delhi, India April 15, 2021. REUTERS/Danish Siddiqui

Patients suffering from the coronavirus disease (COVID-19) get treatment at the casualty ward in Lok Nayak Jai Prakash (LNJP) hospital, amidst the spread of the disease in New Delhi, India April 15, 2021. REUTERS/Danish Siddiqui

A frontline worker in personal protective equipment (PPE) sprays a flammable liquid on a burning funeral pyre of a man who died from the coronavirus disease (COVID-19), at a crematorium on the outskirts of Mumbai India, April 15, 2021. REUTERS/Francis Mascarenhas

A woman mourns after her father died due to the coronavirus disease (COVID-19) outside a mortuary of a COVID-19 hospital in New Delhi, India, April 15, 2021. REUTERS/Danish Siddiqui

A patient with breathing problems wears an oxygen mask as she waits inside an ambulance in a queue to enter a COVID-19 hospital, amidst the coronavirus disease pandemic, Ahmedabad, India, April 14, 2021. REUTERS/Amit Dave

A patient with breathing problem is helped to walk towards an ambulance as he is being shifted to a hospital, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 14, 2021. REUTERS/Amit Dave

Patients suffering from the coronavirus disease (COVID-19) get treatment at the casualty ward in Lok Nayak Jai Prakash (LNJP) hospital, amidst the spread of the disease in New Delhi, India April 15, 2021. REUTERS/Danish Siddiqui

A man wearing a protective suit sits next to the bodies of the victims of the coronavirus disease (COVID-19) inside an ambulance at a mortuary of a COVID-19 hospital in Ahmedabad, India, April 15, 2021. REUTERS/Amit Dave

Patients with breathing problems wear oxygen masks as they wait inside an ambulance in a queue to enter a COVID-19 hospital, amidst the coronavirus disease pandemic, Ahmedabad, India, April 14, 2021. REUTERS/Amit Dave

A patient with a breathing problem wears an oxygen mask as she lies inside an ambulance waiting in a queue to enter a COVID-19 hospital, amidst the coronavirus disease pandemic, Ahmedabad, India, April 14, 2021. REUTERS/Amit Dave

A paramedic adjusts an oxygen mask on a patient with breathing problems inside an ambulance waiting in a queue to enter a COVID-19 hospital, amidst the coronavirus disease pandemic, Ahmedabad, India, April 14, 2021. REUTERS/Amit Dave

A patient with breathing problems wears an oxygen mask as he waits inside an ambulance in a queue to enter a COVID-19 hospital, amidst the coronavirus disease pandemic, Ahmedabad, India, April 14, 2021. REUTERS/Amit Dave

A patient wearing an oxygen mask sits on a bed as he is being shifted to a hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 15, 2021. REUTERS/Amit Dave

A patient lies in a bed as she is being shifted to a hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 15, 2021. REUTERS/Amit Dave

A patient lies inside an ambulance waiting in a queue to enter a COVID-19 hospital, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 14, 2021. REUTERS/Amit Dave