Supporters gather outside the residence of Turkey's President Recep Tayyip Erdogan to celebrate his birthday, in Istanbul, Sunday, Feb. 26, 2017. Turkey will hold a national referendum in April 16 on expanding Erdogan's powers. Critics say it would concentrate even more power in the hands of a leader they accuse of authoritarian behavior. The reforms would potentially allow Erdogan, 63, to remain in power until 2029. (Kayhan Ozer/Presidential Press Service, Pool Photo via AP)