Front-runner’s adult children huddle with their father as staff divides among three competing aides. Donald Trump’s campaign overhaul has inflamed an internecine struggle among three of his closest advisors, creating an atmosphere that multiple sources likened to a political “Hunger Games.” According to interviews with more than a dozen people on or close to the campaign, staffers are increasingly dividing themselves into competing factions aligned with Trump’s three top officials – embattled campaign manager Corey Lewandowski, who still commands deep loyalty among many of the people he hired; deputy campaign manager Michael Glassner, who has a growing group of supporters;...