The head of a provincial branch of Turkey’s ruling Justice and Development Party (AKP) has stirred the pot by tweeting that the country should “get ready for the caliphate” of President Recep Tayyip Erdoğan. Fuat Özgür Çalapkulu, the head of the AKP in the eastern province of Siirt, sent the controversial tweet on March 17, hours after Selahattin Demirtaş, the co-leader of the Peoples’ Democratic Party (HDP), said his party “will never let you be president [in a presidential system].” In his tweet, Çalapkulu said Erdoğan’s opponents had in the past claimed that Erdoğan could not even be a village...