Obama aides said before the Massachusetts trip that the president would travel light, with a skeleton staff. Accompanying him on Air Force One were senior adviser Valerie Jarrett and his counterterrorism adviser, John Brennan. Brennan, who wants to give the president his space while on vacation, briefed Obama on national security issues during the first day on the trip. Brennan also said he would rely on the phone and e-mail to provide other updates not requiring a visit to Blue Heron Farm, the 30-acre property the Obama family was using. "Communication systems are very robust. We can move information at...