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Now Playing: What to expect from new round of impeachment hearings
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Now Playing: Congress to hear from 9 witnesses during 2nd week of public hearings
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Now Playing: 'Beginning of the end for this show trial that we've seen in the House': Sen. Ted Cruz
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Now Playing: Trump 'believes he is above the law and accountable to no one': Rep. Adam Schiff
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Now Playing: Will upcoming Democratic debate be canceled because of strike?
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Now Playing: Mitch McConnell is facing scrutiny from Democrats on impeachment vote
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Now Playing: 2 articles of impeachment against Trump headed for full House vote
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Now Playing: First lady weighs in after Trump attacks teen climate change activist
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Now Playing: House Judiciary Committee approves articles of impeachment
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Now Playing: Judiciary Committee passes articles of impeachment; Boris Johnson wins U.K. election
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Now Playing: House Judiciary Committee passes articles of impeachment
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Now Playing: Trump says impeachment is ‘a witch hunt, it’s a sham, it’s a hoax’