Homeland Security Secretary Markwayne Mullin went on Fox News and told Democratic sanctuary cities exactly what is coming — that if radical left Democrats keep refusing to enforce federal immigration laws, the Trump administration will stop processing international flights into their cities entirely.

The warning landed just two weeks before the FIFA World Cup begins in the United States — and major airline, hotel and tourism groups immediately called the potential move devastating to the industry and to every traveler planning to arrive. Cities like New York, Chicago, Los Angeles and San Francisco — home to some of the busiest international airports in the world — are all on the sanctuary city list and could all be affected. The message from the Trump administration could not be clearer — cooperate or watch your airports go dark.