Supporters attend a rally of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan TPX IMAGES OF THE DAY 

Supporters of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), celebrate his election victory in Istanbul, Turkey, June 23, 2019. REUTERS/Murad Sezer 

A supporter attends a rally of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

REFILE - QUALITY REPEAT Supporters attend a rally of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), holds a rally in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Supporters of the main opposition Republican People's Party (CHP) celebrate their mayoral election victory in Istanbul, Turkey, June 23, 2019. REUTERS/Mesude Bulbul 

Supporters attend a rally of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Supporters attend a rally of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Supporters attend a rally of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), greets supporters at a rally of in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), greets supporters at a rally of in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Supporters attend a rally of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Flares are lit as supporters attend a rally of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Supporters attend a rally of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Supporters attend a rally of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), holds a rally in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan TPX IMAGES OF THE DAY 

Supporters attend a rally of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), in Beylikduzu district, in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

A supporter of of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), waves a Turkish flag out of a car as he celebrates his election victory in Istanbul, Turkey, June 23, 2019. REUTERS/Murad Sezer 

Supporters of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), celebrate his election victory in Istanbul, Turkey, June 23, 2019. REUTERS/Murad Sezer 

Supporters of the main opposition Republican People's Party (CHP) celebrate their mayoral election victory in Istanbul, Turkey, June 23, 2019. REUTERS/Cansu Alkaya 

Supporters of the main opposition Republican People's Party (CHP), celebrate their mayoral election victory in Istanbul, Turkey, June 23, 2019. REUTERS/Mesude Bulbul 

Supporters of the main opposition Republican People's Party (CHP), celebrate their mayoral election victory in Istanbul, Turkey June 23, 2019. REUTERS/Mesude Bulbul 

Binali Yildirim, mayoral candidate of the ruling AK Party, is greeted by a supporter at his party's Istanbul headquarters in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Supporters of the main opposition Republican People's Party (CHP), celebrate at their election coordination centre in Istanbul, Turkey, June 23, 2019. REUTERS/Huseyin Aldemir 

Binali Yildirim, mayoral candidate of the ruling AK Party, leaves after talking to media at his party's Istanbul headquarters in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Election officials open a ballot box to count votes at a polling station in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Turkish President Tayyip Erdogan and his wife Emine greet people after casting their ballots, outside a polling station in Istanbul, Turkey, June 23, 2019. REUTERS/Murad Sezer 

A ballot paper and a stamp are seen at a polling station during a mayoral election re-run in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Turkish President Tayyip Erdogan leaves a voting booth before casting his ballot, at a polling station in Istanbul, Turkey, June 23, 2019. REUTERS/Murad Sezer 

A woman leaves a voting booth before casting her ballot at a polling station in Istanbul, Turkey, June 23, 2019. REUTERS/Murad Sezer TPX IMAGES OF THE DAY 

Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), his wife Dilek and their son Semih cast their ballots at a polling station in Istanbul, Turkey, June 23, 2019. REUTERS/Cansu Alkaya 

Turkish President Tayyip Erdogan and his wife Emine greet people after casting their ballots, outside a polling station in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Binali Yildirim, mayoral candidate of the ruling AK Party, speaks outside a polling station in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Binali Yildirim, mayoral candidate of the ruling AK Party, poses with his wife Semiha and granddaughter casting a ballot at a polling station in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Binali Yildirim, mayoral candidate of the ruling AK Party, is pictured with his wife Semiha outside a polling station in Istanbul, Turkey, June 23, 2019. REUTERS/Kemal Aslan 

Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), speaks next to his wife Dilek and son Semih after casting their ballots at a polling station in Istanbul, Turkey, June 23, 2019. REUTERS/Huseyin Aldemir 

Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), arrives to cast his ballot at a polling station in Istanbul, Turkey, June 23, 2019. REUTERS/Huseyin Aldemir 

Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), addresses his supporters during an election rally in Istanbul, Turkey, June 22, 2019. REUTERS/Murad Sezer 

Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), poses in a boat following an election rally in Istanbul, Turkey, June 22, 2019. REUTERS/Murad Sezer 

Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), is greeted by his supporters during an election rally in Istanbul, Turkey, June 22, 2019. REUTERS/Murad Sezer