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Now Playing: Trump attacks late-night comedians during campaign rally
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Now Playing: Former US presidents get together for a sock-sational photo
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Now Playing: Sessions defends administration's border defense tactics
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Now Playing: The Briefing Room: WH press secretary takes questions on immigration
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Now Playing: Congresswoman urges Americans to confront Trump administration officials
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Now Playing: This Week Off the Set with Chris Christie, Donna Brazile
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Now Playing: Immigration may 'stoke up' GOP, but is a 'losing issue' in Nov: Matthew Dowd
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Now Playing: President Trump continues to blame Democrats for lack of immigration reform
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Now Playing: Trump takes on immigration at campaign-style rally
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Now Playing: Former top Trump aide Tom Bossert on border security, family separation
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Now Playing: Trump blames Democrats for administration's immigration policies
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Now Playing: Trump meets with Angel families as questions persist about immigration policy