The U.S. and Mexican governments are investigating the deadliest human smuggling case in modern U.S. history. At least 51 people died after they were trapped in a sweltering tractor-trailer abandoned on the outskirts of San Antonio, Texas. Aaron Reichlin-Melnick, policy director of the American Immigration Council, joins Stephanie Sy to discuss the context in which these migrant deaths occurred. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders