Turkish President Recep Tayyip Erdogan delivers a speech at the congress of his 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)