Turkish presidential candidate Kemal Kilicdaroglu leads the country’s largest opposition party. ISTANBUL—Turkey’s top opposition candidate for president, Kemal Kilicdaroglu , resting in a hotel suite after addressing throngs of screaming supporters, said he would steer Turkey closer to NATO and the West if he wins Sunday’s election. If Mr. Kilicdaroglu prevails, he says, he would breathe new life into Turkey’s democratic checks and balances after years in which incumbent President Recep Tayyip Erdogan jailed political opponents and reshaped the state to become the most powerful Turkish leader in a century.

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