Turkish President Recep Tayyip Erdogan (R), December 4, 2019. (Peter Nicholls, Pool Photo via AP)

He told TV channel A Haber that Turkey can close down Incirlik and Kurecik if necessary. The US air force uses the airbase at Incirlik for raids on positions held by the Islamic State in Syria. The Kurecik base houses a major NATO radar station.