From the Document: "Congress has demonstrated interest in the global migration crisis, particularly as a result of the recent flows of migrants and refugees to the United States from Central America and Mexico. In 2017 (latest data available) an estimated 232 million international migrants formed roughly 3% of the world's population. [...] In response to increasing numbers of people on the move, the U.N. General Assembly High-Level Plenary Summit on Refugees and Migrants in September 2016 adopted the 'New York Declaration,' which aims to save lives, protect rights, and share responsibility for refugees and migrants on a global scale. Building on this initiative, U.N. member states developed two global compacts--a Global Compact on Safe, Orderly and Regular Migration (GCM) and a Global Compact on Refugees (GCR). In December 2017, the Trump Administration withdrew the United States from the GCM negotiations. (In November 2018, it also withdrew U.S. participation in the GCR.) Refugees are distinct from migrants because of their specific status and protections under international law."
CRS In Focus, IF11003
Congressional Research Service: https://crsreports.congress.gov/