U.S. agents fired tear gas at a group of migrants on Sunday.
Fewer than 100 asylum applications are being processed each day as over 4,000 asylum seekers wait in Tijuana.
Guillén López, the incoming director of Mexico's immigration agency said, “it looks like we are at the border between North and South Korea," while a U.S. Customs and Border Protection spokesman said the agency processes undocumented migrants as “expeditiously as possible.”