President Trump says the nuclear threat from North Korea is over. But new satellite images of hidden missile bases suggest that the situation has only worsened since his meeting with Kim Jong-un, the North Korean leader. Guest: David E. Sanger, a national security correspondent for The New York Times and the author of “The Perfect Weapon: War, Sabotage, and Fear in the Cyber Age.” For more information on today’s episode, visit nytimes.com/thedaily.