After Mueller report, how to ensure 2020 election integrity

Although the Mueller report concluded Russia intervened in the 2016 election in a “sweeping and systematic fashion," the Trump administration has at times downplayed the interference, as well as 2020 election security. Judy Woodruff asks former Homeland Security official Juliette Kayyem and Thomas Rid, author of a forthcoming book on influence campaigns, about what has and hasn't been done.