‘The Trade’ offers nuanced, intimate picture of the complexity of immigration

Immigration at the U.S.-Mexico border is among the most politically divisive issues of our time -- and often presented as black and white. But the second season of filmmaker Matthew Heineman's documentary series "The Trade" offers a complex, intimate and human picture of migrants, traffickers and the U.S. officials enforcing the law. Amna Nawaz talks to Heineman and producer Monica Villamizar.