See also:
Trump Jr. retweets unsubstantiated claim on missing Saudi journalist (that he is a terrorist)
https://www.cnn.com/2018/10/13/politics/donald-trump-jr-jamal-khashoggi/index.html
Excerpt from the article I mentioned in my post 3:
“In the tweet, Poole wrote: “I didn’t realize until yesterday that Jamal Khashoggi was the author of this notorious 1988 Arab News article of him tooling around Afghanistan with Osama bin Laden and al-Qaeda co-founder Abdullah Azzam. He’s just a democrat reformer journalist holding a RPG with jihadists.”
It’s a bit far fetched for anyone to expect cutting ties over this.