Could A Border Wall With Mexico Be An Environmental Disaster?
Wildlife expert and host of ABC's "Ocean Treks" Jeff Corwin explained how a wall between the U.S. and Mexico could stop the natural ebb and flow of species whose lives depend on crossing this border. Then we ask film critic Garen Daly and you: does the classic film Casablanca still hold up today? Plus, Congressman Bill Keating, CNN's John King, historian Nancy Koehn, and more. (This is the full show from 4/25/2017.)