Bernie Sanders kicks off 2020 campaign with rally in his native Brooklyn Video

  • Now Playing: Bernie Sanders joins the 2020 presidential race


  • Now Playing: Bernie Sanders announces 2020 run




  • Now Playing: Trump mocks push for renewable energy




  • Now Playing: Bernie Sanders kicks off 2020 campaign with rally in his native Brooklyn




  • Now Playing: President Trump faces backlash over summit




  • Now Playing: Democrats set deadline for documents on Jared Kushner clearance




  • Now Playing: Warmbiers: Kim and ‘evil regime’ responsible for son Otto’s death




  • Now Playing: White House mum on Kushner security clearance issue




  • Now Playing: Bernie Sanders says ‘you cannot go too far on the issue of climate change’




  • Now Playing: Bernie Sanders says 2020 campaign will be ‘stronger’ and ‘more diverse’ than 2016




  • Now Playing: Did Donald Trump order security clearance for Jared Kushner?




  • Now Playing: Jay Inslee announces 2020 presidential campaign in Seattle




  • Now Playing: Kim Jong Un meets Vietnamese leader after US-North Korea summit collapse




  • Now Playing: 2020 Democratic field swells as WA Gov. Inslee launches campaign




  • Now Playing: Trump ordered Kushner’s security clearance: Report




  • Now Playing: Vice President Mike Pence speaks at CPAC




  • Now Playing: Washington governor launches 2020 run




  • Now Playing: Trump ordered top clearance for Kushner: Report




  • Now Playing: Virginia’s first lady, Pam Northam, under fire




  • Now Playing: Trump and Kim Jong Un fail to reach agreement during summit