ANKARA, TURKEY - MARCH 27: A Turkish citizen hold an empty ballot "Evet - Hayir", means "Yes - No" in Turkish, written on it as voting process for Turkey's upcoming referendum continues for Turkish citizens, registered in abroad electoral register, at Esenboga International Airport on March 27, 2017 in Ankara, Turkey. Turkey will held a referendum on constitutional changes on 16th of April 2017. (Photo by Binnur Ege Gurun/Anadolu Agency/Getty Images)
ANKARA, TURKEY - MARCH 27: An empty referendum ballot, "Evet - Hayir", means "Yes - No" in Turkish, written on it, is seen as voting process for Turkey's upcoming referendum continues for Turkish citizens, registered in abroad electoral register, at Esenboga International Airport on March 27, 2017 in Ankara, Turkey. Turkey will held a referendum on constitutional changes on 16th of April 2017. (Photo by Binnur Ege Gurun/Anadolu Agency/Getty Images)
ANKARA, TURKEY - MARCH 27: A Turkish citizen hold an empty ballot "Evet - Hayir", means "Yes - No" in Turkish, written on it as voting process for Turkey's upcoming referendum continues for Turkish citizens, registered in abroad electoral register, at Esenboga International Airport on March 27, 2017 in Ankara, Turkey. Turkey will held a referendum on constitutional changes on 16th of April 2017. (Photo by Binnur Ege Gurun/Anadolu Agency/Getty Images)
ANKARA, TURKEY - MARCH 27: A Turkish citizen, registered in abroad electoral register, casts his ballot for Turkey's upcoming referendum at Esenboga International Airport on March 27, 2017 in Ankara, Turkey. Turkey will held a referendum on constitutional changes on 16th of April 2017. (Photo by Binnur Ege Gurun/Anadolu Agency/Getty Images)
ANTWERP, BELGIUM - MARCH 27: A Turkish citizen casts her ballot for Turkey's upcoming referendum as voting process for Turkey's upcoming referendum continues for Turkish citizens, registered in abroad electoral register, on March 27, 2017 at a polling station in Antwerp, Belgium. Turkey will held a referendum on constitutional changes on 16th of April 2017. (Photo by Dursun Aydemir/Anadolu Agency/Getty Images)
