The travel industry in the United States is on edge after Homeland Security Secretary Markwayne Mullin reiterated his threat to withdraw US Customs and Border Protection officers from airports in so-called “sanctuary cities” in a move that could jeopardize international flights.

DHS Secretary Markwayne Mullin told travel executives he may target airports in cities that don’t help ICE.

Official Warns U.S. Could Halt Immigration, Customs Processing At 'Sanctuary City' Airports, Sources Say