Erez Lev, from Israeli firm Newsight Imaging, holds a chip and a device used in ongoing clinical trials together with Sheba Medical Center, in which they say a newly developed saliva test aims to determine in less than a second whether or not you are infected with the coronavirus disease (COVID-19), at Tel Hashomer in Ramat Gan, Israel August 13, 2020. REUTERS/Ammar Awad

Chips are seen at Hawksmoor, Seven Dials on the opening day of "Eat Out to Help Out" scheme, amid the coronavirus disease (COVID-19) pandemic, in London, Britain August 3, 2020. Picture taken August 3, 2020. REUTERS/Dylan Martinez

Chips are seen at Hawksmoor, Seven Dials on the opening day of "Eat Out to Help Out" scheme, amid the coronavirus disease (COVID-19) pandemic, in London, Britain August 3, 2020. Picture taken August 3, 2020. REUTERS/Dylan Martinez

U.S. Attorney General William Barr listens to Assistant Attorney General for Legislative Affairs Stephen Boyd as Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Assistant Attorney General for Legislative Affairs Stephen Boyd talks with House Judiciary Committee member Rep. Jim Jordan (R-OH) and other Republican members of the committee during a break in Attorney General William Barr's testimony in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Assistant Attorney General for Legislative Affairs Stephen Boyd talks with House Judiciary Committee member Rep. Jim Jordan (R-OH) and other Republican members of the committee during a break in Attorney General William Barr's testimony in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

Rep. Val Demings (D-FL) questions U.S. Attorney General William Barr during a hearing in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr wears a face mask as he arrives from a break to testify before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr wears a face mask as he arrives from a break to testify before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr hears from one of his staff members as he testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr arrives from a break in his testimony to the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr removes his face mask before testifying to the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol Visitors Center, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr shakes hands with Rep. Ben Cline (R-VA) during a break in a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr removes his mask after a break in a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

Rep. Hakeem Jeffries (D-NY) questions U.S. Attorney General William Barr during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

Rep. Jim Jordan (R-OH) wears a mask while listening to testimony from U.S. Attorney General William Barr during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

Rep. Jim Jordan (R-OH) questions U.S. Attorney General William Barr during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

House Judiciary Committee Chairman Jerry Nadler (D-NY) participates in a House Judiciary Committee hearing where U.S. Attorney General William Barr is appearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr testifies during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

Rep. Jim Jordan (R-OH) questions U.S. Attorney General William Barr during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

Rep. Matt Gaetz (R-FL) questions U.S. Attorney General William Barr during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

Rep. Karen Bass (D-CA) questions U.S. Attorney General William Barr during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

Rep. Jim Jordan (R-OH) participates in in a hearing where U.S. Attorney General William Barr was appearing before the House Judiciary Committee on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

Rep. Matt Gaetz (R-FL) questions U.S. Attorney General William Barr during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

Rep. Karen Bass (D-CA) questions U.S. Attorney General William Barr during a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

U.S. Attorney General William Barr stands up during a break in a House Judiciary Committee hearing on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS

Rep. Jim Jordan (R-OH) talks with colleagues during a break in a hearing where U.S. Attorney General William Barr was appearing before the House Judiciary Committee on Capitol Hill, in Washington, U.S., July 28, 2020. Chip Somodevilla/Pool via REUTERS