In this Thursday, April 4, 2019 photo, a woman, backdropped by the Suleymaniye mosque, buys simit, a pretzel-like snack, in Istanbul. The mood among opposition supporters in Turkey's biggest city is one of jubilation but also worry - fear that their win in Istanbul's mayoral race could be overturned in a recount taking place after the ruling party challenged the election results. (AP Photo/Lefteris Pitarakis)

ANKARA, Turkey - Turkey's ruling party said Sunday it will appeal for a full recount of all votes cast in Istanbul's mayoral election, which the opposition narrowly won in a major setback for President Recep Erdogan.

The opposition's mayoral candidate urged the ruling party to accept defeat.

In the March 31 local elections, the opposition not only prevailed in a tight race in Istanbul, a city of 15 million residents that is Turkey's financial and cultural centre, but took control of Ankara, the capital. Erdogan's party, which had held both cities for decades, contested the results, claiming the elections were "tainted."

The ruling Justice and Development Party, or AKP, won the right for a recount of votes that were previously deemed invalid. But on Sunday, Ali Ihsan Yavuz, a deputy chairman, said the party would appeal to the country's top election authority for a total recount of votes in 38 districts in Istanbul, not just of ballots that were cancelled.

The party made the move after the opposition candidate's lead narrowed to 16,380 votes after some 80% of the invalidated ballots were reassessed in the partial recount.

The opposition Republican People's Party maintains that it looks increasingly unlikely that the invalidated ballots will swing the result in Istanbul in favour of the ruling party.

Ekrem Imamoglu, the opposition party candidate, urged the AKP to concede.

"I understand that it is not easy to lose (Istanbul) after ruling it for 25 years, but this is what democracy is about," Imamoglu said. "It's not the end of the world."

imamoglu also asked the Supreme Electoral Board to assume its "historic duty" and avoid decisions that would lead to suspicions of "double standards" in favour of Erdogan's party.

Yavuz insisted Sunday that the elections were marred by "organized irregularities."

The electoral authority is expected to rule on the request for a full recount in the coming days before confirming the final results of the elections at the end of the week.

News from © The Associated Press, 2019