U.S. President Donald Trump has threatened "severe punishment" if it turns out Khashoggi was killed in the consulate, though he said Washington would be "punishing" itself if it halted military sales to Riyadh. Of 188 stocks traded on the exchange, 179 ended the day with a loss.
However, he has also expressed reservations over sanctioning Saudi Arabia, saying it could have negative economic impacts for the United States.
He also brushed aside the apparent threats from the oil-rich kingdom of economic retaliation if the USA were to impose strict measures and said Mnuchin intends to attend the Saudi conference to address terrorist financing.
"Well, nobody knows yet, but we'll probably be able to find out", Trump said in the interview with Lesley Stahl of CBS's 60 Minutes, which will air in full today.
The Saudi conference is part of Crown Prince Mohammed bin Salman's effort to modernize the kingdom's economy and diversify it away from oil.
Turkish officials claimed that the Saudi Journalist disappeared after entering his country's consulate, While Saudi officials have asserted that Khashoggi has left shortly after he went in the building.
Marco Rubio and Jeff Flake, members of the Foreign Relations Committee, said Congress was prepared to move quickly and firmly if President Donald Trump failed to adequately respond to the October 2 disappearance of Khashoggi, a Washington Post contributor.
On Sunday, Riyadh restated its "total rejection of any threats or attempts to undermine it" through threats, sanctions, or political pressure.
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Aldakhil added that Saudi arms purchases from the us and other trade could be at risk as well. Trump said there would be no United States sanctions on the oil-rich kingdom, claiming that the Saudi's were spending $110 billion (€95 billion) on U.S. military equipment.
The Saudi embassy in Washington later tweeted what it called a clarification, thanking countries including the USA "for refraining from jumping to conclusions" over the case.
When asked if he would impose sanctions on the Saudis, he said it "depends on what the sanction is".
The Saudi dissent vanished after entering the Gulf kingdom's consulate in Istanbul, Turkey 12 days ago.
But Khashoggi's disappearance has led several business leaders and media outlets to back out of the upcoming investment conference in Riyadh called the Future Investment Initiative.
Rubio's comments come a day after Trump vowed "severe punishment" for the USA ally if they were found responsible. They include the CEO of Uber, a company in which Saudi Arabia has invested billions of dollars; billionaire Richard Branson; JPMorgan Chase & Co.
Dimon follows almost a dozen other executives from the technology, media and entertainment industries who have backed out of the Future Investment Initiative conference, nicknamed "Davos in the Desert".
"We can confirm. that Jamie will not be attending the Saudi event", a JP Morgan spokesperson said in an email to the BBC on Monday. Certainly our involvement in Yemen with Saudi Arabia will be affected, " said Flake, R-Ariz.