epa07658572 Supporters of Republican People's Party 'CHP' candidate for Istanbul mayor Ekrem Imamoglu hold banners and flags during his repeated election campaign rally in Istanbul, Turkey, 19 June 2019. According to media reports, the Turkish Electoral Commission has ordered a repeat of the mayoral election in Istanbul on 23 June, after Turkish President Recep Tayyip Erdogan's AK Party had alleged there was 'corruption' behind his party losing.  EPA/SEDAT SUNA
Supporters of Republican People's Party candidate for Istanbul mayor Ekrem Imamoglu. Sedat Suna / EPA

'If we lose Istanbul, we lose Turkey': why the mayoral election is so critical to Erdogan's hold on power