President-elect Donald Trump is expected to pick his current Secret Service detail leader, Sean Curran, to be the new director of the United States Secret Service, according to multiple sources familiar with the decision. For the past four years, Curran has led Trump’s detail and is known to have a close, personal relationship with the president-elect, sources said. Several sources, however, also raised significant concerns that Curran lacks the managerial experience to run an agency as large and complex as the Secret Service. On Trump’s detail, Curran supervised about 85 people. He has never managed the kind of budget or...