Cleaning personnel wait to enter Saudi Arabia's Consulate in Istanbul, Monday, Oct. 15, 2018.
Flake said if the Saudis did, in fact, kill Khashoggi, Congress might specifically curtail US military aid to Saudi-led forces in Yemen.
Diplomatic pressure is growing on the Saudis to give a fuller explanation.
"We strongly denounce this campaign and we stand with Saudi Arabia in the face of these rumors and campaigns targeting it", he said, rejecting the threat of imposition of sanctions on Saudi Arabia or directing threats against it. "He didn't really know, maybe - I don't want to get into his mind but it sounded to me - maybe these could have been rogue killers".
A member of the U.S. Senate Foreign Relations Committee says the U.S. -Saudi relations may need "to be completely revised" if an investigation finds the kingdom's government responsible for the murder of Washington Post contributor Jamal Khashoggi.
Two weeks later, they've yet to go public or release conclusive evidence.
"It depends on how well they cleaned it up", Prinz told The Associated Press. With such a lack of clarity, the administration has not ruled out any possible scenario. He spoke anonymously because he wasn't authorised to discuss the matter.
Earlier, Trump said that he was sending Secretary of State Mike Pompeo to Riyadh and "other places if necessary" to figure out what has happened to Khashoggi.
Turkish officials fear Khashoggi was killed and dismembered.
The State Department has urged a thorough investigation into Khashoggi's disappearance and called on Saudi Arabia to be transparent about the results - advice broadly tracking messages from allies in Europe. Countries are calling for a "credible investigation" into his disappearance with Turkey even accusing Riyadh of not cooperating with the probe. Those policies are all seen as initiatives of the crown prince.
The Saudis themselves are warning they'll respond to any "threats" against the kingdom. He and Trump's son-in-law and senior adviser, Jared Kushner, have forged close ties. "We're going to get to the bottom of it, and there will be severe punishment".
"His voice was a headache for the Saudi government", said Abdulaziz.
Stocks plunge again on wide selling; Dow down as much as 698
The Nasdaq composite has fallen 9.6 percent since it set a record high in late August and the Russell 2000 has fallen 11 percent. Three of the biggest American banks-JPMorgan Chase, Citigroup, and Wells Fargo-will report their third-quarter results Friday.
The report, written by the network's General Manager Turki Aldakhil, stated: "Imposing any type of sanctions on Saudi Arabia by the West will cause the kingdom to resort to other options".
Turki Al Dakhil, who heads the Saudi state-owned Arabiya news network, wrote in an article that USA sanctions against Saudi Arabia could wreak havoc on the global economy by taking oil prices to $200 a barrel and more.
But Ankara and Riyadh disagreed over the search after Saudi officials reportedly said they would only allow a superficial "visual" search. The group included a leading forensic expert, as well as Saudi intelligence officers and Royal Guards.
Japanese SoftBank's shares also took a dive on Monday, falling by almost seven percent over fears for its major financial ties with Saudi Arabia.
Roger Diwan, a longstanding OPEC watcher at consultant IHS Markit Ltd., said the Saudi comments broke "an essential oil market taboo".
Trump said he could not confirm such reports.
"There's something, you'll be surprised to hear me say that, there's something really awful and disgusting about that if that was the case".
Turkey has wanted to search the consulate for days.
Turkey had previously said a working group would be set up in line with a Saudi proposal.
Saudi officials didn't immediately respond to a request for comment on the consulate inspection.
The furor over Khashoggi has dealt a serious setback to Prince Mohammed's aggressive pitch for the kingdom as a destination for foreign investment.
However, more and more business leaders from overseas, including British billionaire Richard Branson and Uber CEO Dara Khosrowshahi, as well as media powerhouses like Bloomberg and CNN, have pulled out after Khashoggi's mysterious disappearance.
SoftBank is now one of the world's most prolific investors, through its "Vision Fund"-a $100 billion war chest that was established a couple years back with a $45 billion infusion from Saudi Arabia's sovereign wealth fund. Recipients of Vision Fund investments have included ride-hailing outfits such as Uber and Didi Chuxing, GM's Cruise self-driving auto subsidiary, chipmakers ARM and Nvidia, and the office-space firm WeWork".