FILE - In this May 12, 2015 file photo, Rep. Adam Schiff, D-Calif., ranking member on the House Intelligence Committee, speaks during an interview with The Associated Press in Washington. U.S. intelligence agencies are investigating the possibility that the Islamic State militant leader killed Friday was the captor of American hostage Kayla Mueller for a time. Schiff confirmed the connection at a breakfast with reporters Tuesday, but declined further comment. ABC News first reported that U.S. officials believe Mueller, whose death was announced in February, spent time in the custody of the Tunisian Islamic State finance man known as Abu Sayyaf. (AP Photo/Alex Brandon, File)