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. Turkey's opposition has dealt President Tayyip Erdogan a stinging blow by winning control of Istanbul in a re-run mayoral election, breaking his aura of invincibility and delivering a message from voters unhappy over his ever tighter grip on power.

REUTERS/Kemal Aslan

A supporter attends a rally of Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), in Beylikduzu district, in Istanbul, June 23. Ekrem Imamoglu of the secularist Republican People's Party (CHP) secured 54.21% of votes, the head of the High Election Board announced on Monday - a far wider victory margin than his narrow win three months ago. The previous result was annulled after protests from Erdogan's Islamist-rooted AK Party, which said there had been widespread voting irregularities. The decision to re-run the vote was criticized by Western allies and caused uproar among domestic opponents who said Turkey's democracy was under threat.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, June 23. On Sunday and in the early hours Monday, tens of thousands of Imamoglu supporters celebrated in the streets of Istanbul after the former businessman triumphed over Erdogan's handpicked candidate by almost 800,000 votes. REUTERS/Kemal Aslan

Ekrem Imamoglu, mayoral candidate of the main opposition Republican People's Party (CHP), holds a rally in Beylikduzu district, in Istanbul, June 23. "In this city today, you have fixed democracy. Thank you Istanbul," Imamoglu told supporters who made heart signs with their hands, in an expression of the inclusive election rhetoric that has been the hallmark of his campaigning.

"We came to embrace everyone," he said. "We will build democracy in this city, we will build justice. In this beautiful city, I promise, we will build the future." REUTERS/Kemal Aslan

Supporters of the main opposition Republican People's Party (CHP) celebrate their mayoral election victory in Istanbul, June 23. The results are likely to trigger a new chapter in Turkish politics, now that the country's top three cities are held by the opposition. Cracks could also emerge within Erdogan's AKP, bringing the economic troubles more to the fore. 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, June 23. 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, June 23. 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, June 23. 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, June 23. 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, June 23. REUTERS/Murad Sezer

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

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

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

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

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

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

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

A woman leaves a voting booth before casting her ballot at a polling station in Istanbul, June 23. REUTERS/Murad Sezer

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, June 23. REUTERS/Cansu Alkaya

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

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

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

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