Turkey's Prime Minister Tayyip Erdogan, with a portrait of modern Turkey's founder Ataturk in the background, watches television at his office at the AK Party headquarters in Ankara June 13, 2011. Erdogan's AK Party has scored a resounding third consecutive election victory, but he will need to seek consensus to push ahead with a planned new constitution. Erdogan, whose AK has transformed Muslim Turkey into one of the world's fastest-growing economies and ended a cycle of military coups, won some 50 percent of the vote in Sunday's election. REUTERS/Umit Bektas

Turkey's Prime Minister Tayyip Erdogan waves to the crowd in Istanbul August 10, 2014. Erdogan?said on Sunday the Turkish people had "shown their will" in a presidential election which local media and allies said he had won, but stopped short of formally declaring victory, saying he would make a full statement later. REUTERS/Osman Orsal

Turkey's President Tayyip Erdogan kisses a handmade Turkish flag, given to him as a gift from Ugandan university student Cemil (not pictured), during a graduation ceremony in Ankara, Turkey, June 11, 2015. REUTERS/Umit Bektas

Turkey's Prime Minister Tayyip Erdogan pauses during a meeting in Ankara October 14, 2009. An agreement signed by Turkey and Armenia on Saturday, which would reopen the border and restore ties poisoned by a century of hostility, could help stabilise the south Caucasus with its vulnerable energy corridor and ease Armenia's geographical isolation. Both parliaments must approve it. But it is resisted by nationalists in both countries as well as Turkish ally and oil and gas producer Azerbaijan. REUTERS/Umit Bektas

Turkey's Prime Minister Tayyip Erdogan acknowledges supporters during the municipal elections outside a polling station in Istanbul March 30, 2014. Erdogan looks set to win Sunday's municipal elections that have become a crisis referendum on his 10-year rule as he tries to ward off graft allegations and stem a stream of damaging security leaks. REUTERS/Murad Sezer

Turkish Prime Minister Tayyip Erdogan throws flowers to his supporters next to his wife Emine during his visit in Cologne May 24, 2014. REUTERS/Wolfgang Rattay

Turkish Prime Minister Tayyip Erdogan applauses during the inauguration of a subway station in Istanbul January 30, 2009. Erdogan was given a hero's welcome on his return to Istanbul on Friday after accusing Israel of "knowing very well how to kill" during a heated debate at the World Economic Forum. REUTERS/Osman Orsal

A grouse sits on Turkish President Tayyip Erdogan's head as he visits a facility of the Forest and Water Management Ministry in Rize, Turkey, August 14, 2015. REUTERS/Stringer

Turkish Prime Minister Tayyip Erdogan attends a ceremony at the mausoleum of Mustafa Kemal Ataturk, marking the 67th anniversary of his death, in Ankara November 10, 2005. Mustapha Kemal Ataturk was the first president of Turkey from 1923 and founder of the modern secular state. He died on November 10, 1938. REUTERS/Umit Bektas

Turkey's Prime Minister Tayyip Erdogan (3rd R) greets his supporters with his family members in Ankara March 31, 2014. Tayyip Erdogan's ruling AKP party appeared on Sunday to be heading for a clear victory in local polls that have become a referendum on a prime minister facing corruption scandals and security leaks he blames on "traitors" embedded in state bodies. Erdogan's family members from L to R are his son-in-law Berat Albayrak, his daughter Esra Erdogan Albayrak, his wife Emine, his son Bilal and his daughter Sumeyye. REUTERS/Umit Bektas

Turkey's Prime Minister and presidential candidate Tayyip Erdogan (C) greets his supporters during an election rally in Istanbul August 3, 2014. Turkey will vote for its first directly-elected president on August 10. REUTERS/Murad Sezer

Turkish President Recep Tayyip Erdogan helps to carry a coffin with a victim of a thwarted coup following a funeral service in Istanbul, Turkey, July 17, 2016. REUTERS/Murad Sezer

Turkey's Prime Minister Tayyip Erdogan (L) and German Chancellor Angela Merkel arrive to address a news conference following their bilateral talks in Berlin October 9, 2010. REUTERS/Fabrizio Bensch

A security officer (L) looks on as Turkey's Prime Minister Tayyip Erdogan (R) speaks to the Libyan people on the 80th anniversary of the martyrdom of Libyan resistance hero Omar al-Mukhtar, near the shrine of his burial place in Benghazi September 16, 2011. Hundreds of Libyans joined Erdogan in prayer on Friday in Tripoli, heaping praise on him for backing the revolt against Muammar Gaddafi. The Turkish prime minister, who is promoting Ankara's blend of Islam and democracy as a model for North African states, hailed Libya's revolution by invoking a symbol of national defiance and anti-colonial resistance -- Omar al-Mukhtar. REUTERS/Esam Al-Fetori

Turkey's ruling party Justice and Development Party leader Tayyip Erdogan attends Friday prayers at the Hacibayram Mosque in Ankara March 7, 2003. Erdogan may win a by-election in Siirt on Sunday which can pave a road to the prime minister's office and a take over of the office from his party ally Prime Minister Abdullah Gul. The 49-year-old Erdogan was barred from running for office in last November's elections for his past conviction for Islamist subversion. His party won a landslide victory in November 2002. REUTERS/str

Turkish President Tayyip Erdogan poses with police officers before a soccer exhibition game at Besiktas Vodafone Arena in Istanbul, Turkey, December 22, 2016. REUTERS/Yagiz Karahan

Turkey's Prime Minister Tayyip Erdogan (L) and Chief of Staff General Ilker Basbug pray during a funeral in Ankara February 28, 2010. Turkey's prime minister met the head of the armed forces on Sunday, two days after the arrest of two retired generals over an alleged coup plot risked renewing tension between the government and the military. REUTERS/Umit Bektas

Turkey's Prime Minister Tayyip Erdogan waves to the crowd in front of the election center in Istanbul August 10, 2014. Erdogan won Turkey's first presidential election on Sunday after securing a majority of the votes, the High Election Board (YSK) said, citing provisional figures. REUTERS/Osman Orsal

Turkey's President Tayyip Erdogan prepares for the welding of the final section of the Yavuz Sultan Selim Bridge, the Third Bosphorus Bridge, during a ceremony in Istanbul, Turkey, March 6, 2016. REUTERS/Tolga Bozoglu

Turkish President Tayyip Erdogan addresses his supporters as his guards secure the stage during a rally for the upcoming referendum in the Kurdish-dominated southeastern city of Diyarbakir, Turkey, April 1, 2017. REUTERS/Murad Sezer

Turkey's Prime Minister Recep Tayyip Erdogan poses with a traditional hat given to him from a young guest from Turkmenistan, in Ankara April 20, 2011. Erdogan met with children around the world who are invited to Turkey as part of celebrations to mark April 23 as National Sovereignty and Child's Day. REUTERS/Stringer

Turkey's Prime Minister Tayyip Erdogan addresses members of parliament from his ruling AK Party (AKP) during a meeting at the Turkish parliament in Ankara January 5, 2010. REUTERS/Umit Bektas

Russian President Vladimir Putin (L) and his Turkish counterpart Tayyip Erdogan enter a hall during a meeting at the Kremlin in Moscow, Russia, March 10, 2017. REUTERS/Sergei Ilnitsky

Turkey's Prime Minister Tayyip Erdogan (C) waves to supporters after arriving at Istanbul's Ataturk airport early June 7, 2013. Erdogan called on Turks on Friday to distance themselves from lawless protests and said accusations of the excessive use of police force during days of unrest were being investigated. Addressing thousands of supporters at Istanbul airport after returning from a trip to North Africa, Erdogan said the protesters had looted shops and damaged businesses and urged his supporters not to be drawn into the violence. REUTERS/Osman Orsal