Now Playing: ABC News Live Prime: Monday, January 25, 2021

Now Playing: Herm Edwards on NFL’s lack of diversity among head coaches

Now Playing: The Rundown: Top headlines today: Jan. 25, 2021

Now Playing: By the Numbers: Biden pooch makes history as 1st White House shelter dog

Now Playing: Vaccinating US won't finish until fall, herd immunity could come sooner: Fauci

Now Playing: ‘Black excellence': Gymnast Nia Dennis’ hip-hop performance goes viral

Now Playing: House delivers article of impeachment against Trump to Senate

Now Playing: White House welcomes its newest canine residents

Now Playing: Protests after police officer drives SUV through crowd in Washington

Now Playing: Biden lifts transgender military ban

Now Playing: UK hospitals struggling with spike in COVID-19 patients

Now Playing: Biden aiming for 1.5 million vaccinations a day across the country

Now Playing: The Breakdown: Transgender military ban reversed

Now Playing: Transgender military ban lifted

Now Playing: COVID-19 crisis

Now Playing: Biden’s economic policies

Now Playing: COVID-19 travel ban

Now Playing: Human trafficking survivor helps others rebuild their lives

Now Playing: Can you spread COVID-19 after getting vaccine?

Now Playing: Meet designer who created inaugural looks for Michelle Obama and Kamala Harris