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Now Playing: SigDigs: Oct. 17, 2019
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Now Playing: House Judiciary Committee passes articles of impeachment against President Trump
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Now Playing: After 14 hours of bitter debate, democrats delayed committee vote on impeachment
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Now Playing: Democrats delay historic vote on impeachment articles
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Now Playing: Sanders campaign manager: 'I'm not going to say we're going to win South Carolina'
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Now Playing: House Judiciary Committee debates 2 articles of impeachment against President Trump
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Now Playing: President Trump goes after TIME person of the year Greta Thunberg
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Now Playing: GOP leader says Republicans ‘will not repeat this’ impeachment process
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Now Playing: Donald Trump mocks Greta Thunberg on Twitter
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Now Playing: Nikki Haley explains Confederate flag comments
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Now Playing: High-stakes UK election to solve Brexit crisis
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Now Playing: House Judiciary Committee debates articles of impeachment
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Now Playing: Trump signs executive order aimed at anti-Semitism
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Now Playing: Judiciary debates impeachment charges against the president
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Now Playing: Judiciary Committee expected to vote on articles of impeachment
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Now Playing: Judiciary Committee holds markup of impeachment articles
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Now Playing: Doug Collins delivers opening remarks: ‘What’s the big lie?’
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Now Playing: Jerry Nadler gives opening remarks at impeachment ‘markup’
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Now Playing: House to draw up articles of impeachment; Boeing under fire