There is a refugee crisis in the USA. Since October over 50,000 children and tens of thousands of families have streamed across the southern border of the United States. What is compelling this surge in migration, particularly of unaccompanied minors? Who are these children and families? And what is their journey like? I speak with Gary Shaye of Save the Children, which is running a relief operation in Texas for children and families that have made it across the border. He answers these questions and more.