Trump's 2018 zero tolerance policy which separated immigrant children from their parents at the border with no plan for reuniting them shocked the American conscience. And even though he claimed to cease the practice within weeks, zero tolerance is rooted in American law that dates back 100 years and remains on the books today. It can easily happen again.  Efrén Olivares was on the front lines defending immigrant families, and the work was personal. Efrén himself is an immigrant, and he joins us to talk about his incredible book, My Boy Will Die of Sorrow: A Memoir of Immigration From the Front Lines.   About the Guest Efrén Olivares is the deputy legal Director of the Immigrant Justice Project at the Southern Poverty Law Center. He was the lead lawyer in a successful landmark petition to the Inter-American Commission on Human Rights on behalf of families separated under the zero-tolerance policy. He previously directed the racial and economic justice program at the Texas Civil Rights Project. His writings on immigration policy have been published by the New York Times, USA Today, and Newsweek. He has testified before Congress and at briefings on Capitol Hill about immigration and border policies. He was the first member of his family to attend college. He is a graduate of the University of Pennsylvania and Yale Law School. He is author of "My Boy Will Die of Sorrow: A Memoir of Immigration From the Front Lines."