ISTANBUL—Voters are returning to the polls in Turkey’s biggest city Sunday in what could shape up as the latest challenge to President Recep Tayyip Erdogan, nearly three months after his movement suffered its biggest setback in more than a decade. A defeat for his Justice and Development Party, or AKP, in the Istanbul mayoral ballot, adding to the loss of the capital, Ankara, in the March municipal elections, would a major blow for Mr. Erdogan at a time when he’s trying to defuse a diplomatic standoff with the U.S. Istanbul,...

Source: Wall Street Journal June 23, 2019 09:11 UTC