ISTANBUL (AP) — The Istanbul mayoral candidates have led their final campaign rallies heading into Sunday's repeat election.

The city election held March 31 saw opposition candidate Ekrem Imamoglu narrowly defeat former Prime Minister Benali Yildirim, the candidate of President Recep Tayyip Erdogan's Justice and Development Party.

The governing party challenged the results and Turkey's election commission voided the vote after Imamoglu had already taken office.

Yildirim has promised to modernize the city's infrastructure and transport systems. Imamoglu focused on urban poverty.

Some analysts say a second defeat in Istanbul would be a blow to Ergodan, who started his political rise as the city's mayor