WATCH: Mississippi's Senate race showdown

WATCH: Mississippi's Senate race showdown
  • Now Playing: Who is Sen. Cindy Hyde-Smith?



  • Now Playing: Republican Senate candidate Cindy Hyde-Smith sparks controversy



  • Now Playing: Mississippi’s Senate race showdown



  • Now Playing: Trump makes final pitch for Hyde-Smith on eve of special election



  • Now Playing: Trump rejects government climate report finding



  • Now Playing: Tensions rise in violence at border town of Tijuana



  • Now Playing: Trump: ‘I don’t believe’ climate change report



  • Now Playing: Trump ‘not happy’ as GM announces new layoffs at auto plants



  • Now Playing: Trump defends use of tear gas on migrants attempting to breach US-Mexico border



  • Now Playing: First lady Melania Trump unveils 2018 White House Christmas decorations



  • Now Playing: Sen. Bernie Sanders says he’s ‘thinking of running’ in 2020



  • Now Playing: Sen. Bernie Sanders on unrest at U.S.-Mexico border



  • Now Playing: President Trump stumps for Republican senator facing allegations of racism



  • Now Playing: Utah Rep. Mia Love concedes, bringing Democrats’ net gain in the House to 39 seats



  • Now Playing: Haley speaks at emergency U.N. meeting as tensions rise between Ukraine and Russia



  • Now Playing: New book gives behind-the-scenes look at Trump White House



  • Now Playing: Trump to campaign for embattled candidate in Mississippi



  • Now Playing: Cokie Roberts: Nancy Pelosi will be next speaker because she’s a ‘master politician’



  • Now Playing: Sen. Sherrod Brown: Democrats should run on message of ‘respecting workers’



  • Now Playing: NASA’s InSight lander touches down on Mars



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