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The Department of Homeland Security (DHS) has federal jurisdiction over public security, which encompasses anti-terrorism, border and port security, immigration and customs enforcement, cybersecurity, maritime security, and disaster response. Its primary mission is the criminal and civil enforcement of federal laws governing these critical areas. [1, 2, 3]

DHS achieves this mandate through several key operational components, each with distinct jurisdictions:

• Border & Immigration: Enforced by U.S. Customs and Border Protection (CBP) and U.S. Immigration and Customs Enforcement (ICE), which hold jurisdiction over border control, customs operations, and the enforcement of federal immigration laws. [1, 2]
• Transportation & Travel: The Transportation Security Administration (TSA) secures the nation’s transportation systems, primarily aviation and passenger travel.
• Maritime Safety: The U.S. Coast Guard operates as a military, multi-mission maritime service, with jurisdiction covering ports, waterways, coastal security, and search and rescue. [1, 2, 3]
• Cybersecurity & Infrastructure: The Cybersecurity and Infrastructure Security Agency (CISA)coordinates security and resilience for the nation’s critical physical and cyber infrastructure. [1]
• Emergency Management: The Federal Emergency Management Agency (FEMA) coordinates the federal government’s role in preparing for, preventing, mitigating, and recovering from both natural and man-made disasters. [1, 2, 3]

DHS operates alongside state and local law enforcement. In certain contexts—particularly regarding immigration—the extent of federal authority and the level of cooperation from state and local authorities vary, as the federal government actively tracks Sanctuary Jurisdictions that limit compliance with federal immigration enforcement. [1, 2]

For legislative and policy matters, DHS operations are subject to oversight by the House Committee on Homeland Security and the Senate Committee on Homeland Security and Governmental Affairs. [1, 2]

The Department of Homeland Security (DHS) is authorized to protect the United States from terrorism and natural or man-made disasters. They are granted extensive federal law enforcement, regulatory, and investigative powers. [1, 2, 3]

These powers span across several core areas of authority:

• Border and Immigration Enforcement: DHS controls the nation’s borders and enforces customs and immigration laws. Agencies like U.S. Customs and Border Protection (CBP) and U.S. Immigration and Customs Enforcement (ICE) have the authority to inspect, detain, and deport individuals, as well as seize contraband at ports of entry. [1, 2, 3]
• Transportation Security: The Transportation Security Administration (TSA) has regulatory authority over the security of the nation’s transportation systems, including airports, airplanes, railroads, and maritime domains. [1]
• Disaster Response: Under the Federal Emergency Management Agency (FEMA), DHS is authorized to coordinate federal government assistance during natural disasters and emergencies, managing federal disaster relief funds and response resources. [1, 2]
• Cybersecurity and Critical Infrastructure: The Cybersecurity and Infrastructure Security Agency(CISA) has the authority to secure the nation’s critical infrastructure (such as energy, communications, and financial systems) against cyber and physical threats. [1, 2]
• Maritime Security: The U.S. Coast Guard, a military and law enforcement branch under DHS, holds authority for maritime safety, sea rescue, and enforcing U.S. laws in U.S. territorial waters and the high seas. [1, 2]
• Intelligence and Protection: DHS analyzes intelligence regarding domestic threats and is responsible for protecting national leaders, visiting dignitaries, and federal facilities, primarily through the U.S. Secret Service. [1, 2, 3, 4, 5]

The Department of Homeland Security (DHS) operates through several major operational and support components. The core agencies and directorates executing its national security, immigration, cybersecurity, and disaster response missions include: [1, 2, 3]

Operational Components

• U.S. Customs and Border Protection (CBP): Secures the nation’s borders and ports of entry, regulating and facilitating international trade and travel.
• U.S. Immigration and Customs Enforcement (ICE): Enforces federal laws governing border control, customs, trade, and immigration, including Homeland Security Investigations (HSI). [1, 2, 3]
• Transportation Security Administration (TSA): Protects the nation’s transportation systems, primarily focusing on aviation security.
• U.S. Coast Guard (USCG): The only military branch in DHS, responsible for maritime safety, security, and environmental stewardship. [1, 2, 3, 4, 5]
• U.S. Secret Service (USSS): Protects national leaders, visiting heads of state, and safeguards the U.S. financial and payment infrastructure. [1, 2, 3, 4, 5]
• Cybersecurity and Infrastructure Security Agency (CISA): Leads the national effort to understand, manage, and reduce risk to both cyber and physical infrastructure.
• Federal Emergency Management Agency (FEMA): Coordinates the federal government’s response to natural and man-made disasters. [1, 2, 3]
• U.S. Citizenship and Immigration Services (USCIS): Oversees lawful immigration to the United States.[1]
• Federal Law Enforcement Training Centers (FLETC): Provides career-long training to federal, state, and local law enforcement professionals.

Support & Staff Components

• Management Directorate: Handles budget, procurement, human resources, and IT for the department.
• Science and Technology Directorate: The primary research and development arm of DHS.
• Countering Weapons of Mass Destruction Office (CWMD): Focuses on preventing attacks against the U.S. using WMDs.
• Office of Intelligence and Analysis: Gathers and shares critical intelligence needed to secure the homeland.
• Office of Policy: Develops long-range strategies and policies for the department. [1, 2]