with producers sam weber and christine romo, we recently went to mexico's southern border with guatemala, to report on this dsperate journey. >> when we met them on this mexico roadside, these families, originally from venezuela, had already been walking for ian days. amna: where are they headed now? >> we are going to the united states, god permitting. >> why did you leave? >> my country, my country. the government is horrible. amna: under a blazing sun, in near 90 degree heat, they share they're heading to the u.s. to seek asylum. we ask what they need. >> water. water. >> and food for the children. amna: 10-year-old brittany has already witnessed and lived what no child should. brittany: we had to pass through the jungle and cross rivers. they stole our money and lied to us. amna: when was the last time you had anything to eat or drink? >> i don't know. amna: but she's fueled by a simple dream. >> i want to study. amna: study, what do you want to study? >> doctor. amna: little brother jason is just jason: i'm going to the five. disney castle. amna: you're going to the disney castle? a