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Now Playing: Lt. Col. Vindman addresses his father: ‘I will be fine for telling the truth’
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Now Playing: With small margins in Georgia, recount is possible
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Now Playing: The latest on Arizona’s vote count
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Now Playing: Joe Biden widens lead in Nevada
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Now Playing: Mark Kelly wins crucial Arizona Senate race
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Now Playing: Joe Biden takes narrow lead in Georgia
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Now Playing: Joe Biden takes the lead in Pennsylvania
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Now Playing: What’s happening in the battleground states where votes are still being counted