Saudi Arabia's Minister of Education Hamad Mohammed al-Sheikh speaks during a media briefing at the media centre during the 15th annual G20 Leaders' Summit in Riyadh, Saudi Arabia, November 22, 2020. REUTERS/Nael Shyoukhi

Saudi Arabia's Minister of Education Hamad Mohammed al-Sheikh speaks during a media briefing at the media centre during the 15th annual G20 Leaders' Summit in Riyadh, Saudi Arabia, November 22, 2020. REUTERS/Nael Shyoukhi

Saudi Arabian Investment Minister Khalid Al-Falih speaks during a media briefing ahead of the 15th annual G20 Leaders' Summit in Riyadh, Saudi Arabia, November 21, 2020. REUTERS/Nael Shyoukhi

U.S. President Donald Trump listens as HHS Secretary Alex Azar speaks about prescription drug prices in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump is followed by HHS Secretary Alex Azar as he arrives to speak about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump is followed by HHS Secretary Alex Azar as he arrives to speak about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump is followed by HHS Secretary Alex Azar as he arrives to speak about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump arrives to speak about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump is followed by Health and Human Services (HHS) Secretary Alex Azar as he arrives to speak about prescription drug prices in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump steps away from the podium as Health and Human Services (HHS) Secretary Alex Azar arrives to speak about prescription drug prices in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump arrives at the podium to speak about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump arrives at the podium to speak about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump listens to administration officials after speaking about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump is seen as he arrives to speak about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump steps away from the podium as he speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump steps away from the podium as he speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump leaves the podium after speaking about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump steps away from the podium as he speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump enters the Brady Press Briefing Room to speak about prescription drug prices during an appearance at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump arrives to speak about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump speaks about prescription drug prices during an appearance in the Brady Press Briefing Room at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

Britain's Health Secretary Matt Hancock speaks during a media briefing at Downing Street, amid the coronavirus disease (COVID-19) outbreak, in London, Britain November 20, 2020. Trevor Adams/Pool via Reuters

Britain's Health Secretary Matt Hancock speaks during a media briefing at Downing Street, amid the coronavirus disease (COVID-19) outbreak, in London, Britain November 20, 2020. Trevor Adams/Pool via Reuters

Britain's Health Secretary Matt Hancock speaks during a media briefing at Downing Street, amid the coronavirus disease (COVID-19) outbreak, in London, Britain November 20, 2020. Trevor Adams/Pool via Reuters

Britain's Health Secretary Matt Hancock speaks during a media briefing at Downing Street, amid the coronavirus disease (COVID-19) outbreak, in London, Britain November 20, 2020. Trevor Adams/Pool via Reuters

Britain's Health Secretary Matt Hancock speaks during a media briefing at Downing Street, amid the coronavirus disease (COVID-19) outbreak, in London, Britain November 20, 2020. Trevor Adams/Pool via Reuters

Britain's Health Secretary Matt Hancock speaks during a media briefing at Downing Street, amid the coronavirus disease (COVID-19) outbreak, in London, Britain November 20, 2020. Trevor Adams/Pool via Reuters

Britain's Health Secretary Matt Hancock speaks during a media briefing at Downing Street, amid the coronavirus disease (COVID-19) outbreak, in London, Britain November 20, 2020. Trevor Adams/Pool via Reuters

Britain's Health Secretary Matt Hancock speaks during a media briefing at Downing Street, amid the coronavirus disease (COVID-19) outbreak, in London, Britain November 20, 2020. Trevor Adams/Pool via Reuters

White House Press Secretary Kayleigh McEnany holds a press briefing at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

White House Press Secretary Kayleigh McEnany holds a press briefing at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

White House Press Secretary Kayleigh McEnany holds a press briefing at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

White House Press Secretary Kayleigh McEnany holds a press briefing at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

White House Press Secretary Kayleigh McEnany holds a press briefing at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

White House Press Secretary Kayleigh McEnany holds a press briefing at the White House in Washington, U.S., November 20, 2020. REUTERS/Carlos Barria

European High Representative of the Union for Foreign Affairs, Josep Borrell, gives a news briefing at the end an informal video conference of EU Defense minister in Brussels, Belgium November 20, 2020. Olivier Hoslet/Pool via REUTERS

European High Representative of the Union for Foreign Affairs, Josep Borrell, gives a news briefing at the end an informal video conference of EU Defense minister in Brussels, Belgium November 20, 2020. Olivier Hoslet/Pool via REUTERS

European High Representative of the Union for Foreign Affairs, Josep Borrell, gives a news briefing at the end an informal video conference of EU Defense minister in Brussels, Belgium November 20, 2020. Olivier Hoslet/Pool via REUTERS

European High Representative of the Union for Foreign Affairs, Josep Borrell, gives a news briefing at the end an informal video conference of EU Defense minister in Brussels, Belgium November 20, 2020. Olivier Hoslet/Pool via REUTERS

European High Representative of the Union for Foreign Affairs, Josep Borrell, gives a news briefing at the end an informal video conference of EU Defense minister in Brussels, Belgium November 20, 2020. Olivier Hoslet/Pool via REUTERS

European High Representative of the Union for Foreign Affairs, Josep Borrell, gives a news briefing at the end an informal video conference of EU Defense minister in Brussels, Belgium November 20, 2020. Olivier Hoslet/Pool via REUTERS

European High Representative of the Union for Foreign Affairs, Josep Borrell, gives a news briefing at the end an informal video conference of EU Defense minister in Brussels, Belgium November 20, 2020. Olivier Hoslet/Pool via REUTERS

European High Representative of the Union for Foreign Affairs, Josep Borrell, gives a news briefing at the end an informal video conference of EU Defense minister in Brussels, Belgium November 20, 2020. Olivier Hoslet/Pool via REUTERS

European High Representative of the Union for Foreign Affairs, Josep Borrell, gives a news briefing at the end an informal video conference of EU Defense minister in Brussels, Belgium November 20, 2020. Olivier Hoslet/Pool via REUTERS

European High Representative of the Union for Foreign Affairs, Josep Borrell, gives a news briefing at the end an informal video conference of EU Defense minister in Brussels, Belgium November 20, 2020. Olivier Hoslet/Pool via REUTERS

European Council President Charles Michel gives a news briefing ahead of G20 meeting in Saudi Arabia, in Brussels, Belgium November 20, 2020. Olivier Hoslet/Pool via REUTERS

European Council President Charles Michel gives a news briefing ahead of G20 meeting in Saudi Arabia, in Brussels, Belgium November 20, 2020. Olivier Hoslet/Pool via REUTERS

European Council President Charles Michel gives a news briefing ahead of G20 meeting in Saudi Arabia, in Brussels, Belgium November 20, 2020. Olivier Hoslet/Pool via REUTERS

European Council President Charles Michel and European Commission President Ursula Von Der Leyen (online) give a news briefing ahead of G20 meeting in Saudi Arabia, in Brussels, Belgium November 20, 2020. Olivier Hoslet/Pool via REUTERS