Behind a Trump aide's surreal plan to shut down travel —and sink the U.S. economy (opens in new tab)

But here is former Oklahoma senator Markwayne Mullin and current DHS secretary, who doubled down last week on Fox on a threat to shut down Customs and Border Patrol processing of flights at major international airports located in “sanctuary cities”—in other words, cities that direct their local law enforcement not to engage in immigration and detention efforts by working with federal agents. It’s not, however, just about working with local law enforcement on immigration. Mullen—and Trump—want...