Opposition’s triumph in Istanbul, where the president had invested significant electoral resources, boosts a party that was left reeling by a general election defeat last year.

Turkey’s President Recep Tayyip Erdoğan suffered a major blow on Sunday, with initial results showing the country’s main opposition party notched up regional election victories around the country.

The opposition Republican People’s Party (CHP) held onto or captured the country’s five biggest cities in Sunday’s vote, which had been seen as a make-or-break moment for a movement still reeling from Erdoğan’s victory in the Turkish presidential contest in May 2023.

The CHP saw its biggest triumph in Istanbul, where Ekrem Imamoğlu was reelected mayor. Europe’s biggest city, Istanbul accounts for 18 percent of Turkey’s population and a third of its economy.

…

A victory in Istanbul — widely considered a microcosm of Turkey — could have given Erdoğan the political momentum and economic resources to move ahead with his goal to amend the constitution to prolong his time in office.