Fahrettin Altun, Erdogan's communications director, told Reuters that the series of "false denials" from Riyadh had led to uncertainty on a host of issues around the case. "Saudi authorities must extradite Mr Khashoggi's killers to Turkey, where they committed a premeditated murder, as proof of their willingness to serve the cause of justice", Altun said.
Ms Callamard also attacked Saudi Arabia's trial of 11 suspects in the case, saying it raises "major concerns" about transparency and fairness.
"Consistent with the previous administration's position and the constitutional separation of powers, the president maintains his discretion to decline to act on congressional committee requests when appropriate", the administration said, adding that the USA already has taken action against the killers.
"They appear to be a continuation of various efforts by different parties to connect His Royal Highness Crown Prince Mohammed bin Salman to this horrific crime".
The relationship between the Kingdom and Vice was initiated by Prince Khalid bin Salman, the Saudi ambassador to the United States and younger brother of the crown prince, who expressed interest in the media company which brands itself to younger audiences as an edgier organization.
His body was reportedly dismembered and has still not been found.
The crown prince said this to a top aide in 2017, the newspaper said, citing unnamed current and former USA and foreign officials described as having first-hand knowledge of intelligence reports on the conversation.
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Cox issued a statement calling the allegations against Fairfax "extremely serious" and said they need a "full airing of facts". Gillibrand stopped short of saying Fairfax should resign, nor did she explicitly state that she believes the allegations.
President Donald Trump may not respond to a congressional request that he determine whether Saudi Arabia's government was responsible for the death of Jamal Khashoggi, a senior administration official said.
Brussels has repeatedly insisted on a transparent and thorough investigation into Khashoggi's murder and called on Saudi officials to cooperate in the ongoing probe.
In light of the revelations, Khashoggi's Turkish fiancee said Friday she hoped pressure from USA lawmakers would encourage the Trump administration to take a tougher stance on the killing.
"I can't comment on reports based on anonymous sources", al-Jubeir said.
United States intelligence understood that Mohammed bin Salman, the country's 33-year-old de facto ruler, was ready to kill the journalist, although he may not have literally meant to shoot him, according to the newspaper.
Saudi Arabia has refused to extradite its citizens to Turkey after the country issued arrest warrants for several Saudi officials. "We have said that those responsible will be held accountable", al-Jubeir said.
The State Department said on Thursday that Washington had already taken action over Khashoggi's killing.