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Now Playing: ABC News Live Prime: Tuesday, November 24, 2020
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Now Playing: The Rundown: Top headlines today: Nov. 23, 2020
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Now Playing: By the Numbers: Biden’s presidential transition is official
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Now Playing: Did ‘Defund the police’ live up to its promise?
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Now Playing: Vaccine Watch: Officials look to vaccine 'D-Day'
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Now Playing: Biden unveils national security team
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Now Playing: The Breakdown - President-elect Joe Biden names his Cabinet picks
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Now Playing: Power of the pardon
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Now Playing: COVID-19 in Montana
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Now Playing: President-elect Joe Biden says 'America is back'
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Now Playing: President-elect Joe Biden names his Cabinet picks
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Now Playing: New Secretary of State Anthony Blinken speaks
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Now Playing: President-elect Joe Biden announces Cabinet nominations
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Now Playing: National security adviser Jake Sullivan speaks
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Now Playing: Special Presidential Envoy for Climate John Kerry speaks
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Now Playing: US Ambassador to the UN Linda Thomas-Greenfield speaks
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Now Playing: Vice President-elect Kamala Harris speaks
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Now Playing: Director of National Intelligence Avril Haines speaks
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Now Playing: John Bolton discusses whether Trump may become security threat after leaving office
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Now Playing: John Bolton defends role in Trump administration