Khashoggi, a critic of the Saudi government and in particular Crown Prince Mohammed bin Salman, was last seen entering the consulate on October 2 to get paperwork for his upcoming marriage to a Turkish woman.
In an overnight 60 Minutes interview, the U.S. leader said the consequences of Saudi Arabia being involved in Khashoggi's death would be "severe". Saudi Arabia, in turn, threatened to retaliate. The kingdom's economy has an influential and vital role in the global economy.
Turkish investigators were on Monday expected to search the Saudi consulate in Istanbul for the first time since journalist Jamal Khashoggi disappeared, after President Recep Tayyip Erdogan and King Salman discussed the case by phone.
Erdogan stressed forming a joint working group to probe the case, said a Turkish presidential source, who spoke on condition of anonymity due to restrictions on talking to media. The statement read, "Germany, the United Kingdom and France share the grave concern expressed by others including HRVP [Federica] Mogherini and UNSG [Antonio] Guterres, and are treating this incident with the utmost seriousness".
"There needs to be a credible investigation to establish the truth about what happened, and - if relevant - to identify those bearing responsibility for the disappearance of Jamal Khashoggi, and ensure that they are held to account", they said".
The Union of the Comoros also affirmed its full solidarity with Saudi Arabia against those who seek to undermine its policy, position, and regional and global status.
In a joint statement on Sunday, the foreign ministers of the UK, France and Germany said "light must be shed" on Khashoggi's disappearance and demanded a "credible investigation".
"His voice was a headache for the Saudi government", said Abdulaziz.
He also said Mnuchin should skip the Saudi conference.
"If President Trump was angered by $80 oil, nobody should rule out the price jumping to $100 and $200 a barrel or maybe double that figure", he wrote.
Commons Foreign Affairs Committee chairman Tom Tugendhat said on Saturday the United Kingdom should work with its allies on its response, and International Trade Secretary Liam Fox should boycott the Future Investment Initiative in Riyadh later this month if Saudi involvement in Mr Khashoggi's disappearance was proven. "For instance, while the country did get headlines for ending its ban on women driving, just weeks before, authorities arrested about a dozen female activists who had campaigned for the right to drive".
Foreign capital is key to Saudi plans for economic diversification and job creation.
News that the CEO of Uber, Dara Khosrowshahi, would pull out of the conference drew angry responses across the region.
Ford Motor Co. confirms that Executive Chairman Bill Ford will not attend.
JP Morgan Chase and Ford did not comment on whether the decision was related to concerns about the disappearance of Khashoggi. But he has said repeatedly that he does not want to halt a proposed $110 billion arms sale to Saudi Arabia - as some in Congress have said he should - because it would harm the USA economically.
While few think that Saudi Arabia is prepared to follow through, even the suggestion of using oil as a weapon undermines Riyadh's long-standing effort to project itself as a force for economic stability. We can not guarantee that it is suitable for the visually or hearing impaired. Some Republicans appear open to the idea.
The Saudi stock market had tumbled 7.2 percent over the previous two trading days but rebounded 2 percent on Monday. After Trump's decision to withdraw the United States from the accord and reimpose USA sanctions, it will become such an outlet again.
The crisis has polarized Saudis, with some blaming the nation's enemies and others concerned about the direction the country is heading under Prince Mohammed.
Trump tweeted Monday that he had spoken with the Saudi king, "who denies any knowledge" of what happened to Khashoggi.
On Friday, a source familiar with the ongoing investigation told CNN that Turkish authorities have audio and visual evidence that Khashoggi was killed inside the consulate.
"But Turkey is determined on the subject of entering the consulate and carrying out a criminal inspection".