During his campaign, President Trump promised to stem migration to the United States. And since taking office his administration has deported plane loads of people, some of whom were in the U.S. legally. Hundreds of deportees have been sent to prison in El Salvador. And President Trump has essentially closed the door to immigrants seeking to enter the country through the border with Mexico. These policies have provoked so-called reverse migration, where people go back to the places they once fled. And that has knock-on effects for other countries. We go to a tiny island in Panama to see the effects of U.S. immigration policy.