However, he has also expressed reservations over sanctioning Saudi Arabia, saying it could have negative economic impacts for the United States.
U.S. treasury secretary Steve Mnuchin on Sunday was second-guessing his stated intention to attend an economic conference in Saudi Arabia, following the disappearance of journalist Jamal Khashoggi inside the Saudi consulate in Istanbul. American lawmakers have threatened tough punitive action against the Saudis, and Germany, France and Britain jointly called for a "credible investigation" into Khashoggi's disappearance.
Mohammed Zidan, market strategist at Thinkmarket in Dubai, said the drop in Saudi stocks was linked to the uncertainty surrounding the Khashoggi affair.
The development comes after a Saudi delegation of a dozen officials arrived in Turkey while Saudi King Salman and Turkish President Recep Tayyip Erdogan at the weekend discussed the case in their first telephone talks on the controversy.
Turkish officials allege he was murdered.
"If U.S. sanctions are imposed on Saudi Arabia, we will be facing an economic disaster that would rock the entire world", Aldakhil wrote on Sunday. "The question here is specifically whether our relationship with Saudi Arabia needs to be completely revised, including arms sales if in fact they carried out something like what they are accused of at this moment". "If it can't be trusted for this, then all bets are off".
Mr Khashoggi, who was considered close to the Saudi royal family, had become a critic of the current government and Prince Mohammed, the 33-year-old heir apparent who has shown little tolerance for criticism.
The statement articulated the concern of the Swiss Foreign Ministry and its hopes to get more explanation on Khashoggi's fate. James Lankford, a Republican, who was at the White House for the arrival of Andrew Brunson, an American pastor who was released from Turkey after almost two years of confinement. Saudi Arabia has fiercely denied that. "We have nothing to hide", he said.
Two of the officials said the search could take place as early as Monday afternoon.
"There is no joint investigation team", he said, adding that Turkey is the only one actually investigating.
A Turkish newspaper also claimed that Khashoggi's Apple Watch recorded audio of his slaying and transmitted it to his iPhone outside the consulate and to his iCloud account. They are ordering military equipment. "I don't think any of our government officials should be going and pretending it's business as usual until we know what's happened here".
Saudi authorities have yet to give a clear explanation of Khashoggi's fate, while several countries - particularly Turkey, the USA, and the U.K - are pressing the case to be cleared up as soon as possible.
He also said Mnuchin should skip the Saudi conference.
The Saudi Gazette trumpeted: "Enough Is Enough".
There's something really bad and disgusting about that if that were the case.