"I have raised Jamal's disappearance personally with the Saudi ambassador, and while we await more information, know we will respond accordingly to any state that targets journalists overseas", Corker wrote on Twitter.
In a statement released on Tuesday evening, Prince Khalid said "I would normally prefer not to address such outrageous claims, especially when it concerns the wellbeing of a missing citizen who dedicated a great portion of his life to serve his country". "We are not in a position to confirm these reports, but we are following them closely", the offcial said.
Khashoggi, 59, went missing while on a visit to the consulate in Istanbul for paperwork to marry his Turkish fiancee.
Salman said that Khashoggi, who was once close to the ruling family in Saudi Arabia, had "always been honest".
"He disagreed with some of the policies of Mohammed bin Salman, but he was not a political dissident, he's not leading any organised network, he was a journalist - he wanted to write and to speak freely, and that was the reason he left Saudi Arabia". Riyadh denies that and claims he left the compound on his own. Turkish officials told Reuters at the weekend they believed he had been killed inside the Saudi consulate.
Saudi Arabia, which ranks 169th out of 180 on RSF's World Press Freedom Index, has launched a modernization campaign since Prince Mohammed's appointment as heir to the throne. All those issues have been viewed as being pushed by Prince Mohammed, who similarly has led roundups of activists, businessmen and others in the kingdom.
Why it matters: The incident threatens a diplomatic crisis in Turkey's relations with Saudi Arabia.
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But since the emergence of Prince Mohammed, 33, as the centre of power in the kingdom a year ago, Khashoggi has been openly critical of the monarchy.
The image was given to the Post by someone close to the Turkish investigation, and released by the USA daily soon after Turkey's President Recep Tayyip Erdogan challenged the Saudis to prove he left the consulate unharmed. The consulate insists the writer left its premises, contradicting Turkish officials. "It is (the duty) of the consulate officials", Mr Erdogan said during a visit to Hungary.
"Do you not have cameras and everything of the sort?"
The details will add to pressure on the Saudi government to explain who the 15 Saudis were and what they were doing during their brief trip to Istanbul. "Why don't you prove it, you have to prove it".
A Turkish official also said Saudi Arabia's envoy to Ankara had been summoned to the foreign ministry for a second time on Sunday and had been asked by Turkish diplomats to be "in full coordination" on the matter.
The country's foreign ministry said Saudi Arabia was "open to co-operation" and a requested search of the building could now go ahead as part of the investigation.
There was no immediate comment on the report from the Saudi authorities. "I do not like it", Trump told reporters on the White House lawn as he was returning from a trip by helicopter to Orlando, Florida.
Meanwhile, the United Nations rights office has urged Turkey and Saudi Arabia to cooperate on the case.