Will Stephen K. Bannon use his return to Breitbart News, a right-wing megaphone, to help the president who dismissed him — or to hurt him? And where can he exert more political power: at Breitbart or in the White House? Guest: Jeremy W. Peters, a reporter in the Washington bureau who has covered the so-called alt-right. For more information on today’s episode, visit nytimes.com/thedaily.