Turkish President Recep Tayyip Erdogan (R) attends the congress of the ruling Justice and Development Party (AKP) in Ankara, Turkey, on Aug. 18, 2018. Turkish President Recep Tayyip Erdogan said Saturday his country would challenge those playing "games" on the economy, a day after two rating agencies downgraded Turkey's rating amid a currency turmoil. (Xinhua/Mustafa Kaya)