this is zaatari refugee camp in jordan, about seven miles from the syrian border. 80,000 syrian refugeesiving in tiny, steel boxes as far as the eye can see. the camp run by the u.n. sprang out of the jordanian desert in poured out of syria. it's now the largest syrian refugee camp in the middle east. >> gina kassem: every refugee here lives now in pre-fab housing. >> whitaker: gina kassem oversees the refugee resettlement program in the middle east and north africa for the u.s. state department. as of late 2016, the u.s. was processing an additional 21,000 syrian refugee applications for relocation to the united states. >> kassem: mostly we focus on victims of torture, survivors of violence, women-headed households, a lot of severe medical cases. >> whitaker: kassem told us each syrian refugee who makes it to the united states goes through a lengthy process of interviews and background checks. you know, there are many americans who don't trust government to fix the roads or run the schools. how can you convince them that this process is going to keep them safe? >> kassem: because they u