There’s a trial underway this week in Tucson, Arizona, that’s getting a lot of attention from people who help migrants at the border. Scott Warren is a humanitarian aid volunteer facing felony charges for transporting and harboring undocumented migrants. If convicted, he could face up to 20 years in prison. Reporter Claire Mullen wanted to see what Warren spent much of his time doing when it came to his activism — so she headed out with volunteers who leave food and water for migrants in the desert.