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Now Playing: Congress didn't specify 'what constitutes a [national] emergency': Terry Moran
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Now Playing: Trump 'united the opposition and divided' GOP with emergency move: Matthew Dowd
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Now Playing: 'I don't think [Trump] knows how to act' in office: Possible 2020 GOP challenger Weld
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Now Playing: 'Everyone knows a wall will help': House Freedom Caucus co-founder Jim Jordan
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Now Playing: Trump 'trying to take the power of the purse away from' Congress: Dem Sen. Duckworth
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Now Playing: 'Definitely and imminently' filing suit against Trump administration: Xavier Becerra
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Now Playing: Trump faces pushback after declaring national emergency to fund border wall
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Now Playing: President Trump faces backlash for triggering a national emergency
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Now Playing: Trump declares national emergency to build southern border wall
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Now Playing: Supreme Court agrees to hear 2020 census citizenship question case
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Now Playing: Trump declares national emergency in the Rose Garden
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Now Playing: Jimmy and Rosalynn Carter captured on kiss cam
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Now Playing: US sanctions top Venezuelan security officials as Maduro digs in
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Now Playing: White House press secretary Sarah Sanders says she was interviewed by Mueller team
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Now Playing: President Trump declares national emergency and claims $8 billion to secure border
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Now Playing: Stacey Abrams reflects on campaign loss
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Now Playing: Trump declares national emergency over border wall funding
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Now Playing: SPECIAL REPORT: President Trump declares national emergency for border wall funding
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Now Playing: President Trump declares national emergency for border wall funding
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Now Playing: Trump is expected to declare a national emergency