. >>> also ahead the legendary sailor, dane ellen mcarthur on her efforts to tackle plastics that are poisoning our oceans. >>> good evening everyone, and welcome to the program. i'm christiane amanpour in london. it's world refugee day and this year it's landed right in the midst of an almighty political and humanitarian row over refugees. a row that is chanllenging the foundations of our democracies from europe to the united states. the pope even weighed in today saying it's immoral to separate families. but from the eastern front where hu hungary passed a harsh knew law to the united states, pope list leaders are having their stay. now after a torrent of criticism over his zero tolerance policy at the mexican border president trump said he'll sign something to keep families together. >> we want to keep families together. i'm going to sign something to do that. people in this room want to do that. they're working on various pieces of legislation to get that done. i'm working on something that will be pre-emptive. >>> but what to do when politics and displaced people collide. i asked