The shadowy leader of an American Muslim organization accused of running terror training camps in the U.S. could find himself being questioned under oath if his outfit follows through on its $30 million defamation suit against the Christian group that leveled the charges in a best-selling book. Muslims of the Americas, a group founded in the 1980s by elusive Pakistani Sheikh Mubarak Ali Gilani, is suing the Christian Action Network for defamation and libel following CAN’s recent publication of the book “Twilight in America: The Untold Story of Islamist Terrorist Training Camps Inside America.” Co-authored by CAN founder Martin Mawyer...