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.
Still, regional traders said speculation the Khashoggi case might deter some inflows of foreign investment - and that a backlash in the US Congress could lead to US sanctions against some Saudi individuals - had triggered panic selling of stocks by some local investors.
"We encourage joint Saudi-Turkish efforts in that regard, and expect the Saudi Government to provide a complete and detailed response".
Trump made a point of visiting the kingdom on his first overseas trip as president and has touted arms sales to Saudi Arabia.
The Muslim World League (MWL) also condemned the attempts to target the Kingdom of Saudi Arabia's worldwide and Islamic leadership by threatening to impose economic sanctions, using political pressure and repeating false accusations.
Now in its fourth year, the war in Yemen costs Saudi Arabia billions of dollars a month and has shown the world that its military-even with the most advanced weaponry and US assistance-is incapable of even defending the country's own borders from lightly armed Houthi rebels and allied militias.
Despite the assurances from the White House that it will take a hardline toward the Saudis if it's revealed that they were involved in Khashoggi's disappearance and possible death, critics of the Trump administration question how the president's previous business dealings with the country will affect his response.
Saudi Arabia on Sunday threatened to retaliate for any sanctions imposed against it after President Donald Trump said the oil-rich kingdom deserves "severe punishment" if it is responsible for the disappearance and suspected murder of Washington Post contributor Jamal Khashoggi.
Neither JP Morgan nor Ford would elaborate on the reasons for the decision not to attend the Future Investment Initiative conference, and did not comment on whether concerns about the disappearance of Jamal Khashoggi were a factor.
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"What has been circulating about orders to kill (Khashoggi) are lies and baseless allegations against the government of the kingdom, which is committed to its principles, rules and traditions and is in compliance with worldwide laws and conventions", Prince Abdulaziz said.
Turkey's foreign minister on Saturday accused Saudi Arabia of failing to cooperate in its probe, calling on Riyadh to grant access to Turkish investigators.
The journalist was once a Saudi government insider, but had gone into self-imposed exile in the USA previous year.
"I tell you what we don't want to do".
Rubio appeared on CNN's "State of the Union, " NBC's "Meet the Press" and CBS' "Face the Nation, " Flake spoke on ABC's "This Week, " and Kudlow also was on ABC and "Fox News Sunday". "I think it is just beyond reality".
This begs the question: just why is the US government involved in arms sales? "We have nothing to hide", he said.
USA lawmakers, for their part, have come out more strongly.
"It's being investigated, it's being looked at very, very strongly", Trump said.