Bernie Sanders: ‘Of course’ Democratic convention will be messy

In a one-on-one interview with NBC’s Kristen Welker, Sen. Bernie Sanders revisited his remarks that the Democratic convention will be “messy,” saying that “democracy is messy” and that “people will have a vigorous debate on the issues.” He denies harming Hillary Clinton’s chances against Donald Trump, and says he believes a Trump presidency would be a “total disaster.”