From the Introduction: "In April 2018, U.S. Customs and Border Protection (CBP) leadership issued guidance that allowed officers to limit asylum seekers' access to ports of entry. This guidance permitted CBP officers stationed at the United States' international boundary with Mexico to inform arriving asylum seekers that U.S. ports of entry were full. Simultaneously, CBP officers also began accepting a specified number of asylum seekers each day, in a process that is known as metering. [...] As metering spread across the border and a subsequent backlog of asylum seekers grew in Mexico's border cities, Mexican authorities and civil society groups responded by providing humanitarian assistance and creating informal waitlists. Since November 2018, the Robert Strauss Center for International Security and Law at the University of Texas at Austin--at times in collaboration with the Center for U.S.-Mexico Studies at the University of California San Diego and the Migration Policy Centre at the European University Institute--has documented these informal lists through quarterly updates. As the COVID-19 [coronavirus disease 2019] pandemic began in March 2020, CBP stopped processing asylum requests at ports of entry altogether. This change took place via a Center for Disease Control's (CDC) regulation based on Title 42 authority and an order that blocked entry for individuals--including asylum seekers--attempting to enter the United States through Mexico without valid travel documents. The use of Title 42 to restrict asylum seeker processing continues to be controversial and questioned by public health experts."
University of Texas at Austin, Robert S. Strauss Center for International Security and Law
University of Texas at Austin, Robert S. Strauss Center for International Security and Law: https://www.strausscenter.org/