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.

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.