Illegal immigration

Police move a semitruck container where the bodies of 39 people were discovered in Grays, England, last week. Peter Nicholls/Reuters hide caption

A San Francisco Police Department booking photo shows Jose Ines Garcia-Zarate, a homeless undocumented immigrant who was acquitted of killing Kate Steinle on a San Francisco pier in 2015. AP hide caption

President Trump has announced plans to impose escalating tariffs on goods imported from Mexico in an attempt to stop migrants from entering the U.S. over the southern border. Shown here are migrants at the border in El Paso, Texas, on Wednesday. U.S. Customs and Border Protection via AP hide caption

U.S. Border Patrol cars are seen from the bridge connecting Eagle Pass, Texas, with Piedras Negras, Mexico, near the banks of the Rio Grande in February. Alexandre Meneghini/Reuters hide caption

President Trump repeated his false claim that the Obama administration had a policy of separating families at the border. Evan Vucci/AP hide caption

Pedestrians crossing from Mexico into the United States at the Otay Mesa Port of Entry wait to use biometric kiosks in San Diego. A new study says visa overstays exceeded illegal border crossings. Denis Poroy/AP hide caption

President Trump says if he doesn't get a border wall, he will declare a national emergency to build it. Jacquelyn Martin/AP hide caption

Issac Rodriguez, from Sinaloa, Mexico, peers through the fence that divides Mexico and the U.S. in Tijuana, Mexico. Rodrigo Abd/AP hide caption

President Trump talks about immigration and gives an update on border security from the Roosevelt Room of the White House on Thursday. Susan Walsh/AP hide caption

Thousands of Honduran migrants and families walk towards the southern Mexico border from Guatemala. Many say they are headed to the U.S. The White House said on Tuesday that a record number of migrant families have arrived at the Southwest border over the last year. Oliver de Roos/AP hide caption