Defense One (Jan. 30) -- Refugees from 11 “high risk” countries whom the Trump administration tried to bar from the United States will once again be allowed to enter if they clear a new, additional set of background checks, a senior administration official said Monday. If the government can figure out how to adapt the TSA’s existing PreCheck screening for use with far larger groups, it could be applied to all prospective immigrants, speeding up the process, says Sheldon H. Jacobson, an aviation security expert and computer science professor at Illinois.