ANKARA, Turkey (AP) — Recep Tayyip Erdogan, who has dominated Turkish politics for the past 15 years, is set to extend his rule with sweeping powers after winning landmark presidential and parliamentary elections.

Turkey's High Electoral Board declared Erdogan, 64, the winner of Sunday's polls, which usher in a new executive presidential system that was approved in a referendum last year. Under the system, the office of the prime minister is eliminated and executive powers are transferred to the president, who can rule with limited checks and balances.

Erdogan's Justice and Development Party fell short of a parliamentary majority but a better-than-expected performance by its nationalist ally would allow the party to control the 600-seat legislature.

Erdogan's closest rival, Muharrem Ince, who complained of unfair elections, has yet to formally concede defeat.