Processing Aliens at the U.S.-Mexico Border: Recent Policy Changes [November 15, 2019] [open pdf - 398KB]
From the Document: "Since FY2017, a growing share of non-U.S. nationals (aliens) arriving at the U.S.-Mexico border request asylum, some at official U.S. ports of entry and others after entering the country 'without inspection' (i.e., illegally) between ports of entry. [...] The Trump Administration is pursuing several policies that change how these aliens are processed when they arrive without valid entry documents. First, under a practice known as 'metering,' aliens may be required to wait in Mexico until there is capacity to process them at a port of entry. Second, the Migrant Protection Protocols (MPP) require some aliens to return to Mexico pending formal removal proceedings. Third, under the third-country transit bar, aliens arriving at the southern border are ineligible for asylum if they traveled through another country without first seeking protection in that country. Although these policies are subject to legal challenge, reviewing courts have so far permitted their implementation."
CRS In Focus, IF11363
Congressional Research Service: https://crsreports.congress.gov/