DHS may stop processing travelers

A warning from the United States Department of Homeland Security landed on April 7, 2026 with a simple implication: some of the busiest airports in the country could stop processing international arrivals if city governments do not cooperate with federal immigration enforcement. Reuters reported that Homeland Security Secretary Markwayne Mullin said customs officials could be pulled from airports in so-called sanctuary cities, which would disrupt arriving passengers and connecting flights almost immediately. (reuters.com) That threat matters because international air travel does not work like a domestic gate change. Every passenger arriving from abroad has to be inspected by United States Customs and Border Protection officers before entering the country or catching most onward flights, so if officers are not there, the airport cannot simply keep the line moving with local staff. (cbp.gov) (dhs.gov) United States Customs and Border Protection handles nearly a million travelers a day across its travel operations, and international airports are one of the main places where that screening happens. The agency checks passports, visas, customs declarations, and admissibility, which means the inspection point is a federal choke point rather than a local airport service that a mayor or airport authority can replace. (cbp.gov) (dhs.gov) The cities at the center of this fight are usually described by federal officials as sanctuary jurisdictions. The Department of Homeland Security published a list of jurisdictions in May 2025 that it said were obstructing federal immigration enforcement, showing that the administration has already been building an official framework for naming and pressuring states, counties, and cities over this issue. (dhs.gov) Markwayne Mullin’s comments did not appear in a vacuum. The Travel, citing the new secretary’s remarks and the policy direction of the administration, reported on April 7, 2026 that pulling federal customs agents from major airports in sanctuary cities would effectively halt international passenger processing and could amount to a de facto ban on international flights at those airports. (thetravel.com) That would hit airports like New York’s John F. Kennedy International Airport, Los Angeles International Airport, and San Francisco International Airport harder than smaller fields because they are major international gateways and connection hubs. A traveler landing from Tokyo, London, or Mexico City cannot legally skip federal inspection just because the terminal is crowded, so one federal staffing decision can ripple through airline schedules, missed connections, baggage systems, and customs halls within hours. (reuters.com) (cbp.gov) There is one partial workaround in the broader system, but it only helps on certain routes. Customs and Border Protection runs preclearance at 15 foreign airports, where travelers are inspected before boarding for the United States, which lets them arrive like domestic passengers, but that network covers only a small share of global departures and cannot absorb the traffic of multiple major American hubs if processing is halted on arrival. (cbp.gov) The administration has already shown a willingness in 2026 to change airport processing rules quickly when it says resources are tight. During the February 22, 2026 shutdown measures, the Department of Homeland Security said Customs and Border Protection would halt Global Entry arrival processing at participating airports and reassign officers to standard traveler processing, which showed how fast federal staffing choices can alter the airport experience. (dhs.gov) That earlier move involved a trusted traveler convenience program, not the core inspection of all international arrivals. The new threat is much broader because it targets the basic function that allows an international airport to receive passengers from abroad in the first place. (dhs.gov) (reuters.com) The political logic is clear even if the legal path is not. Sanctuary city policies are designed to limit how much local police or jails help federal immigration authorities, while the federal government controls the officers who inspect people at the border, so airports become leverage points in a fight that is really about local cooperation with national enforcement priorities. (dhs.gov) (reuters.com) For travelers, the immediate takeaway is not that every international flight is suddenly canceled on April 8, 2026. The takeaway is that the federal government has publicly floated a disruption that would affect arrival processing first, and airlines, airports, and passengers usually feel the effects of that kind of warning before any formal shutdown happens, through schedule uncertainty, longer lines, and contingency planning. (reuters.com) (dhs.gov) If you have an international trip connecting through a major United States airport in the next few weeks, extra buffer time is the practical move. The Department of Homeland Security already maintains travel alert and airport wait-time resources, and those pages are the first place a policy threat like this would turn into an operational headache you can actually see in minutes and missed connections. (dhs.gov) (cbp.gov) What happens next depends on whether this remains a pressure tactic or becomes a formal operational order. As of Wednesday, April 8, 2026, the story is not that international processing has already stopped at major sanctuary-city airports; the story is that the secretary in charge of the system has publicly threatened a step that could freeze international arrivals at some of the country’s biggest gateways if local governments refuse to cooperate. (reuters.com)