In an exclusive interview with NBC News' Cynthia McFadden, Jeanette Manfra, the head of cybersecurity at the Department of Homeland Security, says that 21 states were targeted during the 2016 election.
In an exclusive interview with NBC News' Cynthia McFadden, Jeanette Manfra, the head of cybersecurity at the Department of Homeland Security, says that 21 states were targeted during the 2016 election.