"We write to urge you to personally raise the issue of Virginia resident Jamal Khashoggi's disappearance and welfare with the governments of Saudi Arabia and Turkey".
Turkish officials have since said they believe Khashoggi was killed inside the consulate by a 15-man team sent to Istanbul via private jets under orders from the "highest levels" of the government.
"Victims of the Arab world's authoritarian regimes seek leadership from the USA and DAWN intends to provide such leadership", the organization wrote in a statement listing its core principles. "It is (the duty) of the consulate officials", Erdogan said during a visit to Hungary.
Trump says nobody knows exactly what happened and expressed hope that Khashoggi is not dead.
Earlier on Tuesday, US President Donald Trump said he had not yet spoken to Saudi officials about the journalist's disappearance.
President Recep Tayyip Erdogan pressed Saudi Arabia on Thursday to release images that prove Riyadh's claim missing journalist Jamal Khashoggi left the Saudi consulate in Istanbul alive, vowing Turkey would "not remain silent" in the mystery over his fate. Her statement, posted below, made no mention of any action or acknowledgement on the Saudi side.
Policymakers across Washington expressed concern that the Saudi government's lack of transparency and refusal to provide any information about Khashoggi's whereabouts reflected a darker outcome of the kingdom's relationship with the Trump White House.
At a news conference in front of the Washington Post, Connolly said that President Trump and Secretary of State Mike Pompeo must demand answers from the Saudi government and make it "crystal clear" that the United States will not stand for the killing of journalists.
Saudi Arabia denies this.
On Wednesday, a week after Khashoggi's October 2 disappearance, the White House said that senior officials had spoken to the crown prince, referred to in shorthand as MbS, and Trump described the case as a "very serious situation". "We need a robust, strong, fortified U.S. position that makes it crystal clear that this is not acceptable behavior and those responsible for it will be held to account, no matter how high up it may go".
Secretary of State Mike Pompeo then had a follow-up call with the crown prince to reiterate the US request for information.
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There has been fierce speculation over what happened to Khashoggi, a Washington Post contributor who wrote for Arab and Western media, after he vanished on October 2 following a visit to the consulate to obtain official documents.
Ties between Ankara and Riyadh are at a low point over Turkey's support for Qatar in that country's yearlong dispute with Saudi Arabia and other Gulf nations.
United Kingdom foreign secretary, Jeremy Hunt, has explicitly tied the importance of human rights to alliances, tweeting on Tuesday that if media reports about Khashoggi "prove correct, we will treat the incident seriously - friendships depend on shared values".
The kingdom did not respond to requests for comment Wednesday.
Turkish authorities have said he was killed by members of an elite Saudi "assassination squad", an allegation the Saudi government has dismissed.
"He said the safest country in the world for Saudi Arabians was Turkey", said Yasin Aktay, an Erdogan aide and close friend of Khashoggi.
These men had arrived hours earlier from Riyadh, majority by private plane, the officials said.
In both phone calls, the US officials asked for more details and for the Saudi government's transparency in its investigation, Sanders said.
But if it becomes clear that he ordered the assassination of Khashoggi or was connected to it in some way, it will provoke an outcry on Capitol Hill; embarrass U.S. executives, dozens of whom are flocking to Riyadh for a conference next week where the crown prince is scheduled to speak; and put Kushner, who was once himself a newspaper publisher, in an extremely awkward position.
Both planes later returned to Riyadh with one stopping in Dubai and the other in Egypt, Sabah reported, adding the police were looking into the possibility that Khashoggi was kidnapped.