The Obama administration is expected to announce today the appointment of a new envoy to head the effort to close Guantánamo Bay. Clifford Sloan, a Washington lawyer, has been tapped to head the State Department’s Office of Guantánamo Closure. The office has been idle since January after the administration effectively abandoned the closure effort. More than 100 Guantánamo Bay prisoners remain on a hunger strike to protest their indefinite imprisonment.