On a combative opening day of the NATO summit in Brussels, President Trump called other member countries “delinquent” on military spending and attacked Germany as a “captive” of Russia. We examine where his frustration is coming from. 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.
