Donald Trump wears what's become a campaign signature: his "Make America Great Again" hat. Part of making the country great again, Trump says, is implementing his hard-line immigration plan. Scott Heppell/AP hide caption

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Donald Trump continues to lead in the polls and on Sunday released his first policy position — a conservative proposal on immigration. Seth Wenig/AP hide caption

itoggle caption Seth Wenig/AP

Detainees at the Northwest Detention Center in Tacoma, Wash., gather for a Sikh prayer service. Liz Jones/KUOW hide caption

itoggle caption Liz Jones/KUOW

Tunde Wey gets ready to serve plantains and Jollof rice at his pop-up Nigerian dinner in the kitchen of Toki Underground, a ramen restaurant in Washington, D.C., in December 2014. Eliza Barclay/NPR hide caption

itoggle caption Eliza Barclay/NPR

Marta Elsie Leveron, 19, (left) and her brother Freddy David Leveron, 18, have not seen their father since he left El Savador to work in California in 1999. A new U.S. program allows families to reunite if one parent is a legal U.S. resident. The girl in the middle is Liliana Beatriz Leveron, 16, a cousin of the other two. Her parents are in the U.S. and she's seeking to reunite with them as well. Carrie Kahn/NPR hide caption

itoggle caption Carrie Kahn/NPR

Family detention centers such as this one in Karnes City, Texas, could be forced to close after a judge ruled that holding children for long periods violates current standards. Eric Gay/AP hide caption

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Attorney general nominee Loretta Lynch testifies on Capitol Hill in January. Lynch was confirmed by the Senate on Thursday after months of delay and partisan bickering. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP

African migrants climb the fence that separates Morocco from the Spanish enclave of Ceuta in North Africa in February. Those who make it into Ceuta have reached Spanish — and European Union — soil. Their fate often depends on the country they came from. Some are deported, while others can apply for political asylum or for the status of economic migrant. Reduan/EPA/Landov hide caption

itoggle caption Reduan/EPA/Landov