WASHINGTON — Negina Khalili’s family sold their house and possessions in Afghanistan and flew to a U.S. base in Qatar in January, preparing for the last step in emigrating to America. Thirteen days later, the Trump administration took office — and suspended the refugee program that would have let them in. Now they are among a small group of Afghans who advocates say are waiting at a camp in Qatar for permission to one day come to America. “If they send them back to Afghanistan," Khalili said, “