Trump Admin Threatens International Flight Ban for Sanctuary Cities

Secretary Mullin's role in this initiative began shortly after his reported appointment by President Donald Trump to lead the Department of Homeland Security in March 2026, replacing Kristi Noem. Mullin first floated the idea of impacting air travel as a penalty for sanctuary cities in April, soon after assuming his new position. By May 2026, he had met with executives from the airline and travel industries, discussing the possibility of reducing Customs and Border Protection (CBP) staffing at airports in these cities, a discussion first reported publicly at the time.

President Donald Trump has made stringent immigration policies a cornerstone of his agenda since returning to office in January 2025. On his first day, he signed an Executive Order directing the Attorney General and Homeland Security Secretary to ensure sanctuary cities "do not receive access to Federal funds." Later, on April 28, 2025, President Trump signed Executive Order 14287, titled "Protecting American Communities from Criminal Aliens," which mandated the Justice Department, in collaboration with DHS, to publish a list of sanctuary jurisdictions. The Justice Department subsequently released this list in August 2025, identifying states, cities, and counties with policies deemed to impede federal immigration enforcement. Major international airports in cities on this list include Boston, Chicago, Los Angeles, New York City, Newark, Portland, and San Francisco.

Reactions to Secretary Mullin's threat have been swift and largely critical. Transportation Secretary Sean Duffy, a fellow Cabinet member, expressed reservations, stating that restricting travel based on political views "doesn't make sense" to him. Duffy remarked, "We shouldn't shut down air travel in a state that doesn't agree with our politics." Major trade groups representing the travel industry, including the U.S. Travel Association and Airlines for America, quickly condemned the idea, warning of "devastating consequences" for the industry, communities reliant on international visitation, and the flow of international cargo.

Experts also weighed in with strong opposition. Aaron Reichlin-Melnick, a senior fellow at the American Immigration Council, reportedly called the plan "actively insane," arguing that airlines cannot simply divert large numbers of international flights and would instead face widespread cancellations, causing "enormous economic damage." Juliette Kayyem, who served at DHS under former President Barack Obama, also condemned the proposal, stating, "Of all the bad ideas floated by this Administration, this one ranks."

This latest threat builds on a broader, ongoing narrative of the Trump administration's aggressive enforcement against sanctuary jurisdictions. During his first term in 2017, the administration attempted to cut federal funding to sanctuary cities, but these efforts largely faced setbacks in federal courts. More recently, in April 2025, U.S. District Court Judge William Orrick issued a preliminary injunction against the administration's attempts to withhold millions of dollars in federal grants from Portland and 15 other sanctuary jurisdictions. Judge Orrick later expanded this order in September 2025, blocking the administration from withholding funds from over 30 jurisdictions, including Los Angeles.

Further legal challenges also emerged. In July 2025, U.S. Circuit Judge Lindsey Jenkins dismissed a Trump administration lawsuit against Chicago and Illinois concerning their sanctuary policies, citing a lack of standing. Illinois Governor JB Pritzker reportedly celebrated this ruling, stating, "Illinois just beat the Trump Administration in federal court." Beyond funding threats, the administration has also pursued direct enforcement actions, with ICE reportedly carrying out raids on sanctuary cities starting January 23, 2025, leading to hundreds of detentions and deportations. These actions have ignited protests, such as those in Newark that prompted Mullin's recent remarks, where U.S. Senator Andy Kim was reportedly pepper-sprayed by ICE officers.

The prospect of halting international flights represents a significant escalation in the federal government's pressure tactics against local jurisdictions. The move could have far-reaching economic and social implications, impacting not only travel and commerce but also the communities and individuals living in these cities, as the administration continues to push its immigration enforcement agenda.