Trump Escalates Already-Deadly U.S. Border Policies, Ordering National Guard to Mexican Border

A new wave of troops could soon be deployed to the U.S.-Mexico border, even as border crossings by undocumented immigrants are at their lowest levels since 1971. The move comes as a caravan of Central American migrants and asylum seekers in Mexico has prompted a series of threats from President Trump. Meanwhile, The Wall Street Journal reports the Trump administration is requesting that the U.S. military build walls for at least one military base along the U.S.-Mexico border. We go to Tucson, Arizona, for an update from Todd Miller, a border security journalist and author of "Storming the Wall: Climate Change, Migration, and Homeland Security."