-
Now Playing: Clinton Tourism In Arkansas: Go Along For The Ride On A 'Billgrimage'
-
Now Playing: Check Out The Giant Inflatable Keystone Pipeline In Mary Landrieu's Front Yard
-
Now Playing: Trump blasted FDA for not moving faster, hours before COVID-19 vaccine authorization
-
Now Playing: ABC News Live Prime: Friday, December 11, 2020
-
Now Playing: The Rundown: Top headlines today: Dec. 11, 2020
-
Now Playing: By the Numbers: NYC bans indoor dining
-
Now Playing: Here’s everyone who's tested positive for COVID-19 in connection to the White House
-
Now Playing: President Trump slams FDA over 'slow' authorization of COVID-19 vaccine
-
Now Playing: The Breakdown: FDA expected to authorize Pfizer vaccine for emergency use within days
-
Now Playing: White House demanding FDA chief authorize vaccine today or resign
-
Now Playing: Why Emily Oster made her own COVID-19 database| FiveThirtyEight
-
Now Playing: Katie Porter weighs in on 106 House Republicans backing Texas' election challenge
-
Now Playing: Katie Porter reacts to heated exchange with Steve Mnuchin over COVID-19 relief
-
Now Playing: Republicans in Congress join Trump in trying to overturn election
-
Now Playing: Trump gains support in bid to overturn election
-
Now Playing: ABC News Live Prime: Wednesday, December 10, 2020
-
Now Playing: The Rundown: Top headlines Thursday: Dec. 10, 2020
-
Now Playing: 17 states back Trump in longshot Supreme Court ask
-
Now Playing: First ladies discuss being kind, paying it forward this holiday season amid pandemic
-
Now Playing: Hunter Biden targeted in tax probe