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Now Playing: Trump to meet with Republican lawmakers on immigration
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Now Playing: Laura Bush calls Trump immigration policy 'cruel'
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Now Playing: President Trump doubles down on immigration amid backlash
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Now Playing: FiveThirtyEight: Looking ahead to Donald Trump's immigration speech
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Now Playing: Outrage over 'zero-tolerance' immigration policy
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Now Playing: Crisis at the border
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Now Playing: Debate over Trump administration's 'zero-tolerance' policy heats up
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Now Playing: US withdraws from UN Human Rights Council
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Now Playing: All GOP senators want to halt separation of families at border, McConnell says
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Now Playing: President Trump digs in on false claim that crime on rise in Germany
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Now Playing: Rev. Al Sharpton decries separation of immigrant families
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Now Playing: Senators refute Trump's stance that only Congress can end child separation at border
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Now Playing: Congressman blasts immigration policy, makes emotional plea to GOP
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Now Playing: Justice Department IG investigating Comey memos after FBI referral