Declaring a National Emergency Concerning the Southern Border of the United States

President Trump declared a national emergency at the southern border under the National Emergencies Act, invoking military construction authority (10 U.S.C. § 2808) and Ready Reserve activation authority (10 U.S.C. § 12302) to enable Department of Defense support for border security, including potential border wall construction and troop deployment.

Federal Register Open PDF 84 FR 4949

Key directives

Secretary of Defense or relevant military department Secretaries shall order Ready Reserve units/members to active duty to support DHS at southern border
Secretary of Defense, Interior, Homeland Security, and military department Secretaries shall take all appropriate actions to use or support use of invoked authorities, including transfer and acceptance of jurisdiction over border lands if necessary

Who is ordered

Timeline

Immediate

national emergency declaration takes effect
10 U.S.C. § 12302 invoked for Ready Reserve activation
10 U.S.C. § 2808 construction authority invoked

Near term (90d)

potential activation of Ready Reserve units
potential transfer of jurisdiction over border lands
DOD support operations at southern border

Long term

potential border barrier construction
ongoing military support to DHS
possible legal challenges to emergency declaration

Risks & tensions

invocation of military construction authority for border wall funding triggered separation-of-powers disputes and litigation
Ready Reserve activation for domestic border mission raised questions about appropriate military role
potential land jurisdiction transfers implicate private property and tribal sovereignty concerns
proclamation cites worsening situation 'in recent years' without explicit attribution to prior administration