President Trump listens to acting Homeland Security Secretary Chad Wolf during a May briefing. Trump announced on Twitter he was nominating Wolf as DHS chief, but it's unclear if the GOP-controlled Senate will vote to confirm him. Evan Vucci/AP hide caption
Asylum seekers stand at a bus stop after they were dropped off by Immigration and Customs Enforcement at the Greyhound bus station in El Paso, Texas on Dec. 23. Paul Ratje/AFP/Getty Images hide caption
Neighbors carry the coffin that contains the body of Jakelin Caal Maquin into her grandparents' home in San Antonio Secortez, Guatemala. The 7-year-old girl died while in the custody of the U.S. Border Patrol. Oliver de Ros/AP hide caption
Homeland Security Secretary Kirstjen Nielsen announced a host of "extraordinary protective measures" designed to improve conditions for children and adults held in U.S. Customs and Border Protection custody. Susan Walsh/AP hide caption
Secretary of Homeland Security Kirstjen Nielsen speaks in front of the border wall separating Tijuana, Mexico, and San Diego. Gregory Bull/AP hide caption