Republican People's Party, or CHP, supporters gather to celebrate outside City Hall in Istanbul, Turkey, Sunday, March 31, 2024. Turkey's main opposition party retained its control over key cities and made huge gains elsewhere in Sunday's local elections, preliminary results showed, in a major upset to President Recep Tayyip Erdogan, who had set his sights on retaking control of those urban areas. (AP Photo/Khalil Hamra)