Khashoggi, a U.S. resident, Washington Post columnist and leading critic of the powerful Saudi crown prince, Mohammed bin Salman, vanished after entering the Saudi consulate in Istanbul two weeks ago to get marriage documents.
CNN also reported Monday that Saudi Arabia was preparing a statement disclosing that Khashoggi was killed as "the result of an interrogation that went wrong" as part of an operation meant to abduct the Washington Post contributor and transport him back to Saudi Arabia. Although officials agreed to the investigation, Whitson said that the message from the Saudi government is clear. According to CNN, the report will likely claim the interrogation was conducted without clearance or transparency.
King Salman phoned Erdogan Sunday evening "to thank the president for welcoming the kingdom's proposal to form a joint working group" to discuss the disappearance, the Saudi foreign ministry said.
"The king firmly denied any knowledge of it", Trump told reporters after speaking with King Salman.
President Trump said Monday that the Saudi king strongly denied his government's involvement in the disappearance of journalist Jamal Khashoggi, saying the king suggested it could have been "rogue killers".
Turkish investigators completed a search of the Saudi consulate in Istanbul on Tuesday, for the first time since journalist Jamal Khashoggi disappeared. Prince Mohammed told Reuters previous year that Blackstone and BlackRock Inc were planning to open offices in the kingdom.
One person familiar with the Saudi plans said on Monday that the Saudi government was preparing to describe a scenario that would protect the prince from any blame.
Alhadj said he didn't think the Khashoggi case would have much influence on American officials who retire and go to work for the Saudis, providing their expertise to the kingdom for a hefty paycheck.
Last week, an anonymous Turkish official alleged that 15 Saudi operatives had flown into the country, bringing with them a doctor and a bone saw with which to dismember Khashoggi's body and smuggle it out of the consulate building.
September 28: Khashoggi visits the Saudi Consulate in Istanbul for the first time to pick up a permission document to marry Cengiz.
Khashoggi was USA resident and wrote articles for The Washington Post, splitting his time between Virginia, London, and Istanbul since he left Saudi Arabia in June 2017. A police dog was part of the search team.
The head of JP Morgan, Jamie Dimon, is one of the latest high-profile executives to pull out.
Prince Mohammed has aggressively pitched the kingdom as a destination for foreign investment.
The Yemeni statement said Saudi Arabia was being targeted due to its "honourable and honest positions" towards a range of issues, particularly its role in combating "terrorism and extremism" fostered by Iran.
A critic of Saudi Arabia's Crown Prince Mohammed bin Salman, Mr Khashoggi visited the consulate to obtain a document confirming he had divorced his ex-wife, in order to allow him to remarry.
Meanwhile on Monday, a team of Turkish and Saudi investigators entered the Saudi Consulate in Istanbul, the Associated Press reported.
She asked the government to defend human rights and halt a $15-billion arms deal exporting weapons to Saudi Arabia.