Read more live updates below.Markwayne Mullin Says He May Take A ‘Hard Look’ At Customs Processing At Airports In ‘Sanctuary’ CitiesNew Homeland Security Secretary Markwayne Mullin floated the possibility of targeting “sanctuary” cities in a new way while speaking with Fox News' Bret Baier on Monday.When asked how he aimed to deal with cities that limit cooperation with federal immigration enforcement, Mullin suggested that the policies in these places weren’t “lawful” and questioned whether they should be processing customs in their airports.“Some of these cities have international airports. If they’re a sanctuary city, should they really be processing customs into their city?” Mullin said. “Seriously, if they’re a sanctuary city and they’re receiving international flights, and we’re asking them to partner with us at the airport, but once they walk out of the airport, they’re not going to enforce immigration policy? Maybe we need to have a really hard look at that.”When Baier asked if Mullin was suggesting that these cities "might lose their customs," the DHS chief stopped short of committing to any specifics.A DHS spokesperson did not immediately respond to a request for comment.Were Mullin to pull customs agents from major airports in cities like San Francisco and New York City, travel could be affected for millions of people who pass through these locations.See All UpdatesClose