While these were some of the sharpest comments Mattis has made on the Khashoggi killing, he also said the two countries still needed to collaborate on stability in the region.
"Failure of any one nation to adhere to global norms and the rule of law undermines regional stability at a time when it is needed most", Mattis told a separate session of the annual Manama Dialogue security conference.
"But he said he didn't", she says. Eighteen others have been arrested.al-Qahtani, it has been reported, led the interrogation of Lebanese Prime Minister Saad Hariri when he was detained in Saudi Arabia a year ago after being enticed to the country to meet the crown prince.
Meanwhile, al-Jubeir said the Gulf crisis did not impact military coordination among members of the Gulf Cooperation Council (GCC), including Qatar.
She also said she had declined an invitation to meet Donald Trump, saying the US President was not honest about investigating the killing.
But "if as a whole European Union we stopped arms deliveries to Saudi Arabia, that could help bring these conflicts to an end", she told Germany's Die Welt newspaper. Yesterday authorities in Riyadh stated that Khashoggi's murder was premeditated.
"Above all the terrible war in Yemen and the Qatar crisis should lead us to finally act in a united fashion as the European Union towards Saudi Arabia", Kneissl told Die Welt.
According to a statement signed by Peter Nkanga and Chido Onuma, the group urged Saudi Arabian citizens to understand that they deserve better than what they described as "a blood thirsty leadership". I think people have assigned blame on Saudi Arabia with such certainty before the investigation is complete.
Prince Mohammed, the heir apparent to the kingdom's throne, has denounced the "repulsive" murder, denying any involvement.
Pro-government Turkish media said that intelligence officers showed Haspel video images and audio tapes of Mr Khashoggi's killing gathered from the consulate. "The 1970s oil embargo ... and 9/11 was a shock to the relationship but we always go back, roll up our sleeves, works at it and make sure the relationship comes out stronger than before", he said. "We maintain our strong people-to-people partnership, knowing that with our respect must come transparency and trust".
Still, Mattis' speech also reflected the hard dilemma this has caused.
Mattis said a US presence would remain in Syria for the long-haul, to "expand space for our diplomats to negotiate for long-term peace".
Mattis warned that Russia's presence in the Middle East - where it is a major ally of Syrian President Bashar al-Assad - could not be a replacement for the United States.
However extending the USA presence will mean added costs to the US budget that Trump has previously been opposed to. The crown prince graduated from King Saud University in law.
Khashoggi, a Washington Post columnist and a United States resident, was killed after entering the consulate to obtain a document that would allow him to remarry.
For comparison, the USA has spent nearly $9 billion in humanitarian aid for Syria and the combined costs of operations since 2014 against the Islamic State in Syria and Iraq have topped $23 billion, according to the Congressional Research Service.