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"The kingdom condemns the latest position of the US Senate that was based on unsubstantiated allegations and rejects the blatant interference in its internal affairs," the foreign ministry said in a statement released by the official Saudi Press Agency.

The rebuttal came after the Republican-controlled Senate voted on Thursday to end US military support for the Riyadh-led war in Yemen, and separately held Crown Prince Mohammed bin Salman responsible for Khashoggi's killing. 

The largely symbolic vote dealt a fresh warning to President Donald Trump, who has staunchly backed the Saudi regime in the face of intense global outrage that analysts say has left the kingdom diplomatically weakened.

On the Yemen measure - which more broadly attacks the president's prerogative to launch military action - 49 Democrats or their allies voted in favour, along with seven Republicans, while another three Republicans abstained.

The Senate also approved a resolution condemning Khashoggi's murder and calling Crown Prince Mohammed bin Salman, Saudi Arabia's de facto ruler, "responsible" for it.

The Saudi ministry warned that the kingdom would not tolerate any "disrespect" of its rulers.

"This position by the US Senate sends the wrong messages to all those who want to cause a rift in Saudi-US relationship," the ministry said.

"The kingdom hopes that it is not drawn into domestic political debates in the US to avoid any... significant negative impact on this important strategic relationship."

'Vulnerable to pressure'

A day after the Senate vote, Secretary of State Mike Pompeo again defended US ties with Saudi Arabia on national security grounds, saying the kingdom was a bulwark against common foe, Iran.

The Senate resolution acknowledged the US-Saudi ties were "important" but called on Riyadh to "moderate its increasingly erratic foreign policy".

"Prince Mohammed and Saudi Arabia, even prior to introduction of the Senate resolution, were discovering that the Khashoggi killing had weakened the kingdom internationally and had made it more vulnerable to pressure," said James Dorsey, a Middle East expert at the S. Rajaratnam School of International Studies in Singapore.

The resolutions cannot be debated in the House of Representatives before January, and would likely be vetoed in any case by Trump.

But the Senate votes send a strong message to the White House over anger on both sides of the aisle towards Riyadh.

Khashoggi, a Saudi contributor to the Washington Post, was killed on October 2 shortly after entering the kingdom's consulate in Istanbul in what Riyadh called a "rogue" operation.

The murder has tarnished Riyadh's international reputation, and Western countries including the United States, France and Canada have placed sanctions on nearly 20 Saudi nationals.

On Sunday, UN chief Antonio Guterres called for a "credible" probe into the murder.

Anger at the human cost of the war in Yemen has also prompted a harder line in Congress about the US military's role in backing Saudi-led coalition strikes against Houthi rebels.

Western governments have pressed for an end to the war, which massively escalated when the Saudi-led alliance intervened in 2015 to restore the government of Abd Rabbo Mansour Hadi after Houthi rebels overran the capital.

The Sweden talks mark the first attempt in two years to broker an end to the Yemen conflict, which has killed more than 10,000 people - though rights groups say the actual figure is five times higher.

Government shelling and Saudi air strikes were reported on the port city of Hodeida on Saturday evening, despite a truce.

Some 14 million people are at imminent risk of starvation in Yemen, according to UN estimates.

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