Declaring a National Emergency Concerning the Southern Border of the United States: Proclamation 9844 by the President of the United States of America, February 15, 2019 [open pdf - 204KB]
Proclamation 9844 issued by the president on February 15, 2019, declares a state of national emergency at the southern border to address the issues of illegal immigration and criminal trafficking into the United States: "The current situation at the southern border presents a border security and humanitarian crisis that threatens core national security interests and constitutes a national emergency. The southern border is a major entry point for criminals, gang members, and illicit narcotics. The problem of large-scale unlawful migration through the southern border is long-standing, and despite the executive branch's exercise of existing statutory authorities, the situation has worsened in certain respects in recent years. [...] Because of the gravity of the current emergency situation, it is necessary for the Armed Forces to provide additional support to address the crisis."
Federal Register: http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR
Federal Register (February 20, 2019), v.84 no.34, p.4949