The Biden administration says it is officially ending the controversial Trump-era “Remain in Mexico” policy that forces asylum seekers to wait in Mexico as their cases wind through court, often in grueling conditions for months or years. We speak to attorney and activist Efrén Olivares with the Southern Poverty Law Center’s Immigrant Justice Project about the impact of this policy, as well as ongoing efforts to reunite families separated at the U.S.-Mexico border under the Trump administration’s “zero tolerance” policy in 2018. Olivares represented some of the children and their parents, and wrote about them in his new book, “My Boy Will Die of Sorrow: A Memoir of Immigration from the Front Lines.”