Saudi Arabia is the home of the terrorist ideology and Saudi backed terrorists operated in conjunction with US-UK-Western and even Israeli support one could argue in Syria for the last seven years.
I think the President is hedging a bit, he did the sword dance with the leaders in Saudi Arabia last year, but here we are.
The Turks say they have audio and video evidence of Khashoggi's murder. He has killed and dismembered with a bone saw we are told.