Protestors hold up signs, during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

Protestors hold up signs, during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor holds up signs, during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor holds up a sign during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor holds up a sign during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor holds up a sign during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor holds up a sign during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor holds up a sign during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor holds up a sign during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor holds up a sign during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor gestures during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor holds a banner during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor holds up a sign during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor holds up a sign during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor wearing a face mask attends a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

Protesters attend a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor holds a flare during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

A protestor holds a sign during a demonstration of NHS staff, unions and campaigners protesting the government's handling of the coronavirus disease (COVID-19) crisis, in London, Britain, August 8, 2020. REUTERS/Simon Dawson

WASHINGTON, D.C.- AUGUST 6, 2020: Senator Maggie Hassan (D-NH) questions Chad Wolf, acting Secretary of Homeland Security, who appears before the Senate Homeland Security and Governmental Affairs Committee on August 6, 2020 in Washington D.C. to explain the use of federal agents during protests in Portland, Oregon. Toni Sandys/Pool via REUTERS

WASHINGTON, D.C.- AUGUST 6, 2020: Senator Maggie Hassan (D-NH) questions Chad Wolf, acting Secretary of Homeland Security, who appears before the Senate Homeland Security and Governmental Affairs Committee on August 6, 2020 in Washington D.C. to explain the use of federal agents during protests in Portland, Oregon. Toni Sandys/Pool via REUTERS

WASHINGTON, D.C.- AUGUST 6, 2020: Senator Maggie Hassan (D-NH) questions Chad Wolf, acting Secretary of Homeland Security, who appears before the Senate Homeland Security and Governmental Affairs Committee on August 6, 2020 in Washington D.C. to explain the use of federal agents during protests in Portland, Oregon. Toni Sandys/Pool via REUTERS

WASHINGTON, D.C.- AUGUST 6, 2020: Senator Maggie Hassan (D-NH) questions Chad Wolf, acting Secretary of Homeland Security, who appears before the Senate Homeland Security and Governmental Affairs Committee on August 6, 2020 in Washington D.C. to explain the use of federal agents during protests in Portland, Oregon. Toni Sandys/Pool via REUTERS

A message thanking health workers of the NHS is seen on office windows with the Shard skyscraper behind, as the outbreak of the coronavirus disease (COVID-19) continues, in London, Britain, August 6, 2020. REUTERS/Toby Melville

A message thanking health workers of the NHS is seen on office windows with the Shard skyscraper behind, as the outbreak of the coronavirus disease (COVID-19) continues, in London, Britain, August 6, 2020. REUTERS/Toby Melville

Formula One F1 - British Grand Prix - Silverstone Circuit, Silverstone, Britain - August 2, 2020 A "Thank you NHS" message is seen on a spitfire before the race Pool via REUTERS/Bryn Lennon

Formula One F1 - British Grand Prix - Silverstone Circuit, Silverstone, Britain - August 2, 2020 A "Thank you NHS" message is seen on a spitfire before the race Pool via REUTERS/Bryn Lennon

Formula One F1 - British Grand Prix - Silverstone Circuit, Silverstone, Britain - August 2, 2020 A "Thank you NHS" message is seen on a spitfire before the race Pool via REUTERS/Andrew Boyers

Soccer Football - FA Cup Final - Arsenal v Chelsea - Wembley Stadium, London, Britain - August 1, 2020 Patches on Nicolas Pepe's Arsenal shirt showing support for the NHS, the Black Lives Matter campaign and the Sound of Support campaign, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Pool via REUTERS/Adam Davy

Senator Chris Coons (D-DE) speaks to Senator Robert Menendez (D-NJ), Senator Rob Portman (R-OH) and Senator Jeanne Shaheen (D-NH) during a break in a State Department's 2021 budget, in the Dirksen Senate Office Building, in Washington, D.C., U.S., July 30, 2020. Greg Nash/Pool via REUTERS

An NHS employee is seen at a testing centre near the Crown and Anchor pub following a spike in cases of the coronavirus disease (COVID-19) to visitors of the pub in Stone, Britain, July 30, 2020. REUTERS/Carl Recine

An NHS employee holds a sample at a testing centre near the Crown and Anchor pub following a spike in cases of the coronavirus disease (COVID-19) to visitors of the pub in Stone, Britain, July 30, 2020. REUTERS/Carl Recine

An NHS employee collects a sample at a testing centre near the Crown and Anchor pub following a spike in cases of the coronavirus disease (COVID-19) to visitors of the pub in Stone, Britain, July 30, 2020. REUTERS/Carl Recine

An NHS employee collects a sample at a testing centre near the Crown and Anchor pub following a spike in cases of the coronavirus disease (COVID-19) to visitors of the pub in Stone, Britain, July 30, 2020. REUTERS/Carl Recine

NHS staff holding placards pose before handing a petition with almost 500,000 signatures demanding a pay rise for all NHS staff, amid the coronavirus disease (COVID-19) outbreak, at the entrance to Downing Street in London, Britain, July 30, 2020. REUTERS/John Sibley

An NHS staff member holds a placard before handing a petition with almost 500,000 signatures demanding a pay rise for all NHS staff, amid the coronavirus disease (COVID-19) outbreak, at the entrance to Downing Street in London, Britain, July 30, 2020. REUTERS/John Sibley

An NHS staff member holds a placard before handing a petition with almost 500,000 signatures demanding a pay rise for all NHS staff, amid the coronavirus disease (COVID-19) outbreak, at the entrance to Downing Street in London, Britain, July 30, 2020. REUTERS/John Sibley

NHS staff in uniform holding placards talk before handing a petition with almost 500,000 signatures demanding a pay rise for all NHS staff, amid the coronavirus disease (COVID-19) outbreak, at the entrance to Downing Street in London, Britain, July 30, 2020. REUTERS/John Sibley

Britain's Prime Minister Boris Johnson talks with a paramedic Jack Binder and firefighter Tom Binder as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson talks with CEO London Ambulance Service Garrett Emmerson as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson talks with a paramedic as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson talks with a paramedic as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson talks with CEO London Ambulance Service Garrett Emmerson as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson talks with CEO London Ambulance Service Garrett Emmerson as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson talks with a paramedic as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson talks with a paramedic as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson talks with a paramedic as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson talks with a paramedic as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson talks with a paramedic as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson talks with a paramedic as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson boards an ambulance to talk with a paramedic as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson wears a protective mask as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson wears a protective mask as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson talks with CEO of the London Ambulance Service Garrett Emmerson and Chair of the London Ambulance Service Heather Lawrence as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson gives an elbow bump greeting as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson gives an elbow bump greeting as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson gives an elbow bump greeting as he visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson, wearing a face mask, visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson, wearing a face mask, visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson, wearing a face mask, visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS

Britain's Prime Minister Boris Johnson, wearing a face mask, visits headquarters of the London Ambulance Service NHS Trust, amid the spread of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. Ben Stansall/Pool via REUTERS