On Monday afternoon, Carrie Feit paced the sidewalk along the perimeter of a sprawling federallyowned complex across the street from an air force base in Homestead, Florida. It’s been more than a year since the property was last used to detain more than 2,000 immigrant children who crossed the border without an adult or who had been separated from their family members. The site was shut down during the Trump era amid an avalanche of scandals, including allegations of sex abuse involving the kids housed there. But as talk of a “surge” of migrants at the border has picked up...