Homeland Security Act & DHS Organization

The Department of Homeland Security (DHS) was created by the Homeland Security Act of 2002 — the largest reorganization of the federal government since the National Security Act of 1947 — consolidating 22 agencies into a single department to address post-9/11 security needs. DHS is now the third-largest federal department with approximately 250,000 employees and a budget exceeding $60 billion. Its component agencies span an enormous range: Customs and Border Protection (CBP) and Immigration and Customs Enforcement (ICE) handle border security and immigration enforcement; the Transportation Security Administration (TSA) screens passengers at airports; USCIS adjudicates immigration benefits; the Coast Guard handles maritime security; the Secret Service protects the president; FEMA manages disaster response; and CISA handles cybersecurity. The breadth of DHS's mission — border security, counterterrorism, cybersecurity, disaster response, transportation security — reflects how post-9/11 threat perception reshaped federal organization. The department has been persistently controversial, with critics arguing it's too large and bureaucratically dysfunctional, and ongoing political battles about its immigration enforcement priorities that shift significantly between administrations.

Current Law (2026)

Legal Authority

• 6 U.S.C. § 111 — Establishment of DHS (executive department; headed by a Secretary; mission: prevent terrorist attacks, reduce vulnerability, minimize damage from attacks and natural disasters)
• 6 U.S.C. § 112 — Secretary; functions (chief executive of DHS; authority over all department functions; security policy coordination)
• 6 U.S.C. § 201-203 — Information Analysis and Infrastructure Protection (Under Secretary for Intelligence and Analysis; threat assessment and information sharing; infrastructure protection)
• 6 U.S.C. § 231-240 — Border, Maritime, and Transportation Security (consolidation of border security functions; CBP and ICE establishment; immigration enforcement transferred from DOJ)
• 6 U.S.C. § 311-321 — Emergency Preparedness and Response (FEMA within DHS; Administrator reports to Secretary; national preparedness; grants)
• 6 U.S.C. § 341-349 — DHS management and personnel (Chief Human Capital Officer; workforce development; DHS officer and employee responsibilities)
• 6 U.S.C. § 651-674 — CISA (Cybersecurity and Infrastructure Security Agency; Director; cybersecurity, infrastructure protection, and emergency communications)
• 6 U.S.C. § 113 — Other officers (Deputy Secretary, Under Secretaries for Intelligence and Analysis, Science and Technology, and Management; Commissioner of CBP; Directors of ICE, Secret Service, USCIS — all Senate-confirmed)
• 6 U.S.C. § 114 — Sensitive Security Information (SSI coordinator in every DHS office handling SSI; controls disclosure of security-sensitive transportation and homeland security data)
• 6 U.S.C. § 121/121a — Office of Intelligence and Analysis and Homeland Security Intelligence Program (Under Secretary for I&A manages DHS intelligence activities; serves as the department's intelligence bridge to the IC and state/local partners)
• 6 U.S.C. § 124h — State, Local, and Regional Fusion Center Initiative (DHS provides intelligence analysts, security clearances, and technology to state-run fusion centers for terrorism and crime information sharing)
• 6 U.S.C. § 126 — DHS Data Framework (shared data platform integrating existing DHS systems for authorized personnel while maintaining privacy and civil liberties protections)
• 6 U.S.C. § 142 — Privacy Officer (senior official reporting to Secretary; reviews all DHS technology and programs for privacy impacts; investigates privacy complaints)
• 6 U.S.C. § 146 — Cybersecurity Workforce Assessment (annual evaluation of DHS cybersecurity staffing readiness, recruitment pipelines, and skill gaps)
• 6 U.S.C. § 238 — Office for Domestic Preparedness (primary federal lead for state and local preparedness against terrorism; equipment, training, exercises, and technical assistance)
• 6 U.S.C. § 381-383 — Secret Service Transfer (moved Secret Service from Treasury to DHS as a distinct entity; authorizes use of undercover investigation proceeds; establishes National Computer Forensics Institute)
• 6 U.S.C. § 591 — Countering Weapons of Mass Destruction Office (Assistant Secretary coordinates all DHS CWMD activities: detection, prevention, and response to chemical, biological, radiological, and nuclear threats)

Implementing Regulations (CFR)

• 6 CFR Part 158 — DHS Cybersecurity Talent Management System (excepted service hiring, compensation, and career development for cybersecurity positions across DHS)
• 6 CFR 25.9 — SAFETY Act product certification (procedures for certification and designation of approved anti-terrorism technologies under the Homeland Security Act)

How It Works

The Department of Homeland Security was created in response to the September 11, 2001 terrorist attacks — the largest reorganization of the federal government since the creation of the Department of Defense in 1947. DHS consolidated 22 previously independent agencies from across the federal government into a single department with a unified homeland security mission.

The department's component agencies span an extraordinary breadth of government functions. Customs and Border Protection (CBP) — the largest federal law enforcement agency (~60,000 employees) — secures U.S. borders, processes imports, and manages ports of entry. Immigration and Customs Enforcement (ICE) enforces immigration law in the interior, detains and deports unauthorized immigrants, and investigates transnational crime. TSA screens 2+ million passengers daily at airports. USCIS processes immigration benefits — green cards, naturalization, work permits, asylum applications. Coast Guard (transferred from DOT), Secret Service (transferred from Treasury), FEMA, and CISA round out the portfolio. Before DHS, these functions were scattered across multiple departments — border inspections split between INS (DOJ) and Customs (Treasury), Coast Guard in DOT, Secret Service in Treasury, FEMA independent — and the Homeland Security Act under 6 U.S.C. § 111 brought them under a single secretary to fix the pre-9/11 coordination failure. Critics have argued the consolidation created a massive, unwieldy department with disparate agency cultures and competing missions.

A central purpose of DHS was to bridge the intelligence-sharing gap exposed by 9/11. DHS's Office of Intelligence and Analysis (I&A), established under 6 U.S.C. § 121, serves as the link between the Intelligence Community and state, local, tribal, and private-sector partners; a network of approximately 80 state-run fusion centers (§ 124h) blends federal intelligence with local law enforcement information, with DHS providing analysts and security clearances. The Countering Weapons of Mass Destruction Office (§ 591) coordinates all DHS activities related to chemical, biological, radiological, and nuclear threats, and leads the interagency National Biodefense Strategy alongside DOD, HHS, and USDA. Immigration functions are divided among three DHS agencies: CBP handles border enforcement and admission at ports of entry, ICE handles interior enforcement and removal, and USCIS handles immigration benefits — a concentration of functions that has been praised for unified management and criticized for creating an enforcement-first culture around what is also a humanitarian and economic policy domain.

How It Affects You

State Variations

Pending Legislation

• HR 7744 — DHS Appropriations Act, FY 2026. Annual funding bill for the Department of Homeland Security. Status: Passed House.
• HR 7436 — DHS Intelligence and Analysis Training Act. Establishes training standards for DHS intelligence analysts. Status: Introduced.
• HR 6507 — DHS Grants Accountability Act. Strengthens oversight and accountability requirements for DHS grant programs. Status: Introduced.
• HR 7435 — DHS Intelligence Transparency and Ombuds Act. Creates an ombudsman for the DHS Office of Intelligence and Analysis. Status: Introduced.
• HR 6548 — DHS Suicide Prevention for Law Enforcement Act. Establishes suicide prevention programs for DHS law enforcement personnel. Status: Introduced.

Recent Developments

• DHS immigration enforcement as a primary mission (2025): Under Secretary Kristi Noem and the Trump administration, DHS fundamentally shifted toward treating immigration enforcement as its dominant mission. ICE conducted unprecedented interior enforcement operations; the National Guard was deployed at the border; active-duty military were assigned immigration support roles; and CBP received substantial new resources. ICE detention capacity was dramatically expanded. The administration described the initiative as the "largest deportation operation in American history," with stated goals of removing millions of undocumented immigrants.
• CISA and cybersecurity changes: CISA (Cybersecurity and Infrastructure Security Agency), which had emerged as a key federal cybersecurity defender under Biden, faced leadership turbulence in 2025. Director Jen Easterly resigned; Trump appointees reviewed CISA's programs and staffing. Concerns arose about whether CISA's election security work — which had drawn ire from Trump allies after 2020 — would be curtailed. State and local election officials expressed concern about losing federal cybersecurity support for election infrastructure.
• FEMA budget and disaster response: FEMA faced scrutiny and budget pressure as the Trump administration sought to shift disaster response costs to states. Proposals to restructure or partially privatize FEMA's role generated significant debate, particularly after major disasters (hurricanes, wildfires). The administration's position that states should bear more disaster response costs clashed with states' fiscal capacities and federal disaster declaration precedents.
• Fusion centers and information sharing: DHS's network of state and local fusion centers — information-sharing hubs for counterterrorism and law enforcement — faced questions about their mission scope, effectiveness, and civil liberties implications as the administration broadened the definition of domestic security threats to include illegal immigration and drug trafficking.