The Department of Homeland Security has entered a partial shutdown after Congress failed to pass a funding measure before lawmakers departed Washington, leaving key security operations in a state of uncertainty.

The lapse follows days of tense negotiations on Capitol Hill over spending levels and policy provisions tied to immigration enforcement and border management.

With no agreement secured before the deadline, appropriations for DHS expired, affecting a department responsible for border security, disaster response, cybersecurity and transportation safety.

While essential personnel — including Border Patrol agents, Transportation Security Administration officers and Coast Guard members — will continue to work, they will do so without pay until funding is restored.

Non-essential operations face suspension, and certain administrative and grant-related activities are expected to slow or halt.

Lawmakers from both parties acknowledged the risks associated with interrupting funding for a department central to national security.

Disagreements centred on policy riders and broader budgetary disputes that have complicated passage of several spending bills this fiscal year.

The shutdown comes at a particularly sensitive time for homeland security operations, as migration levels, disaster preparedness demands and cyber threats remain high on the national agenda.

Federal officials have stressed that frontline security efforts will continue uninterrupted, though prolonged funding gaps could strain morale and operational efficiency.

Congress is expected to reconvene in the coming days to attempt to resolve the impasse.

Until an agreement is reached and signed into law, DHS will remain partially shuttered, adding pressure on lawmakers to negotiate a compromise that restores full funding and operational stability.