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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: Comey doesn't agree with IG report but respects the criticism
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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: Trump launches into free-wheeling defense of 'zero tolerance policy'
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Now Playing: Lawmakers turned away from migrant detention center
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Now Playing: DHS Secretary Kirstjen Nielsen says separating kids at border isn't abuse
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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: Trump to meet with Republican lawmakers on immigration
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Now Playing: Justice Department IG investigating Comey memos after FBI referral
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Now Playing: President Trump doubles down on immigration amid backlash
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Now Playing: Nielsen defends family separation as enforcing the law: 'We will not apologize'
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Now Playing: Trump directs creation of 'space force' as sixth branch of military
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Now Playing: Trump: 'The US will not be a migrant camp'
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Now Playing: Trump blames Democrats for border policy separating children from parents
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Now Playing: Supreme Court puts off weighing in on partisan gerrymandering