U.S. President Donald Trump and Democratic presidential nominee Joe Biden participate in their final 2020 U.S. presidential campaign debate at Belmont University in Nashville, Tennessee, U.S., October 22, 2020. U.S. President Donald Trump and Democratic challenger Joe Biden offered sharply contrasting views on the still-raging coronavirus pandemic at Thursday's (October 22)final presidential debate, seeking to persuade the few remaining undecided voters 12 days before the Nov. 3 election. REUTERS/Mike Segar

U.S. President Donald Trump and Democratic presidential candidate former Vice President Joe Biden answer a question during the second and final presidential debate at the Curb Event Center at Belmont University in Nashville, Tennessee, U.S., October 22, 2020. Trump has trailed Biden in opinion polls for months, though the contest is tighter in some battleground states likely to decide the election. Morry Gash/Pool via REUTERS

U.S. President Donald Trump and Democratic presidential nominee Joe Biden are reflected in the plexiglass protecting a tv camera operator from covid as they participate in their second 2020 presidential campaign debate at Belmont University in Nashville, Tennessee, U.S., October 22, 2020. Trump, a Republican, adopted a more restrained tone than he did during the chaotic first presidential debate in September, when he repeatedly interrupted Biden. REUTERS/Mike Segar

U.S. President Donald Trump answers a question as Democratic presidential candidate former Vice President Joe Biden listens during the final presidential debate at the Curb Event Center at Belmont University in Nashville, Tennessee, U.S., October 22, 2020. Morry Gash/Pool via REUTERS

Democratic presidential nominee Joe Biden smiles during the second 2020 presidential campaign debate with U.S. President Donald Trump at Belmont University in Nashville, Tennessee, U.S., October 22, 2020. REUTERS/Jonathan Ernst

U.S. President Donald Trump participates in the final 2020 U.S. presidential campaign debate with Democratic presidential nominee Joe Biden at Belmont University in Nashville, Tennessee, U.S., October 22, 2020. REUTERS/Jonathan Ernst