Turkey's highest electoral board is meeting to decide whether an opposition politician is the rightful winner of Istanbul's mayoral race — or whether a new election must be held.

Ekrem Imamoglu narrowly won the race for mayor of Istanbul in Turkey's March 31 local elections, defeating ruling party candidate Binali Yildirim, a former prime minister.

President Recep Tayyip Erdogan's ruling party is however, challenging the result, citing alleged irregularities that it insists impacted the result of the vote. It wants the election in the city to be repeated.

The Supreme Electoral Board began its deliberations on Monday. A decision could come later or in the next few days.