O n Saturday, Markwayne Mullin, the Department of Homeland Security secretary, used a speech at Kansas City International Airport to deliver an unusual message. Customs and Border Protection officers stood around him as a backdrop, and in his right hand, Mullin held the squishy pink ball he carries as a stress-management tool, gripping it as he spoke. The United States isn’t fully prepared to host the biggest, most expensive sporting event in world history—and, he wanted to make clear, it’s not