Turkish President Recep Tayyip Erdogan announced over the weekend that he will reveal the "naked truth" behind Khashoggi's killing on Tuesday.
Saudi Arabia says it does not know the body's whereabouts, with anonymous officials saying it was rolled into a carpet and given to a "local collaborator" to be disposed of, a claim dismissed by Turkish sources.
The Saudis' greatest concern is the United States, a crucial military ally against archrival Iran and a key source of the kind of foreign investment they will need to reform the economy.
Hollywood, too, has been reassessing its ties to Saudi Arabia, where the crown prince recently lifted a ban on movie theaters.
Turkish officials say the Turkish president and his American counterpart have spoken over the phone and discussed the killing of Saudi journalist Jamal Khashoggi.
Khashoggi was a Washington Post columnist and lived in the USA, having fled Saudi Arabia last September. The friend spoke on condition of anonymity for fear of repercussion.
German Chancellor Angela Merkel said she supports the suspension of arms exports to Saudi Arabia following the killing of journalist Jamal Khashoggi. However, pro-government newspapers have been leaking information about Khashoggi's killing, apparently with the help of Turkish security forces.
But doubts remain in the global community over whether the admission really means that the Saudi government is willing to come clean, especially over any involvement by the crown prince.
Saudi Arabia did not immediately respond to a request for comment Monday.
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He said the Saudis did not know how Khashoggi, a Saudi national and US resident, had been killed or where his body was.
Merkel had said Sunday that "when it comes to our already limited arms exports. they can not take place in the current situation".
On Friday, during a roundtable in Arizona, asked if he believed whether the Saudi explanation that Khashoggi was killed during a "fistfight" with more than a dozen agents was credible, he said: "I do. I do".
On Sunday, Britain, Germany and France issued a joint statement indicating that the Saudi explanation of Khashoggi's killing did not go far enough.
"Only when all European nations are in agreement will this make an impression on Riyadh", he said, speaking on public television.
In a sign of growing pressure on Saudi Arabia, Turkey said it will announce details of its investigation into the killing of journalist Jamal Khashoggi on Tuesday and US congressional leaders said the Gulf kingdom - in particular its crown prince - should face severe consequences for the death of the writer in the Saudi consulate in Istanbul. All of them shield King Salman and his son and from any involvement.
That's according to statements published early Monday by the state-run Saudi Press Agency.
The kingdom's announcement comes two days after acknowledging that the Washington Post writer was killed October 2 at the consulate under disputed circumstances.