Department of Homeland Security's Reported 'Metering' Policy: Legal Issues [April 29, 2019] [open pdf - 633KB]
From the Document: "Generally, a non-U.S. national (alien) who arrives in the United States without valid documentation may pursue asylum and related protections if the alien demonstrates a credible fear of persecution or torture in his or her country of origin. In recent years, the Department of Homeland Security's (DHS) U.S. Customs and Border Protection (CBP) has reportedly been limiting the number of asylum seekers who may be processed each day at designated ports of entry along the U.S. southern border. Aliens reportedly affected by this policy generally have not yet reached the U.S. border and, while at the cusp of physical entry, remain in Mexico. This policy--known as 'turnback' or 'metering'--is intended to address an 'unprecedented rise in asylum requests,' as well as safety and health concerns resulting from overcrowding at ports of entry."
CRS Legal Sidebar, LSB10295
Congressional Research Service: https://crsreports.congress.gov/