Secretary of Homeland Security Kirstjen Nielsen shakes hands with President Trump in El Centro, Calif., on April 5 after he arrived to visit the border wall between the United States and Mexico.
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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.
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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
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.