mexican border

In this Nov. 1, 2018, file photo, President Donald Trump talks about immigration and gives an update on border security from the Roosevelt Room of the White House in Washington. Civil liberties groups have filed a lawsuit in federal court in San Francisco to block the Trump administration from returning asylum seekers to Mexico while their cases wind through U.S. immigration courts. The American Civil Liberties Union and other groups said in the suit filed Thursday, Feb. 14, that the policy puts asylum seekers in danger and violates U.S. immigration law. (AP Photo/Susan Walsh, File)

Migrants run from tear gas launched by U.S. agents, amid photojournalists covering the Mexico-U.S. border, after a group of migrants got past Mexican police at the Chaparral crossing in Tijuana, Mexico, Sunday, Nov. 25, 2018. The mayor of Tijuana has declared a humanitarian crisis in his border city and says that he has asked the United Nations for aid to deal with the approximately 5,000 Central American migrants who have arrived in the city. (AP Photo/Rodrigo Abd)

A memorial plaque of Jose Antonio Elena Rodriquez is displayed on the corner of Calle Internacional (International Street) in Nogales, Mexico, where Rodriguez was allegedly shot and killed by a U.S. Border Patrol agent in 2012. (Dani Jardine)