USCRI Snapshot:  The Migrant Protection Protocols (MPP) policy, also referred to as Remain in Mexico, is a program that was originally implemented by the Trump administration in 2019. The program requires asylum seekers to stay in Mexico while their asylum cases are pending in U.S. immigration courts. The policy has had grave effects on the safety of migrants, who are forced to stay in Mexico in dangerous and inadequately resourced camps. The Biden administration has made attempts to dismantle MPP in the last year but have been challenged in court by the state of Texas and the state of Missouri. At the same time, the Administration has expanded MPP to include more migrants than the original policy. This resource lays out a timeline of MPP from its inception to the recent Supreme Court decision to review the Fifth Circuit Court of Appeals decision in Biden v. Texas.