People line up to cross into the United States to begin the process of applying for asylum near the San Ysidro Port of Entry in Tijuana, Mexico. President Trump has threatened to close the border to asylum-seekers.
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
U.S. Border Patrol boats move along the Rio Grande near an international crossing between the United States and Mexico on March 16. Customs and Border Protection have announced that apprehensions along the southwest border dropped in both February and March, when they usually rise.
John Moore/Getty Images