On October 2, Khashoggi's fiancée Hatic Cengiz waited for him outside the Consulate for 11 hours, but he never came out-and Cengiz fears that Khashoggi was either kidnapped or killed.
Riyadh and Ankara have also differed on the subject of the Muslim Brotherhood in Egypt and on the Israeli-Palestinian conflict, where Saudi Arabia has unofficially backed the so-called U.S. "deal of the century", whereas Turkey has condemned the Trump administration's attempt to "force a deal on the Palestinians". Trump heaped praise on Prince Mohammed when he made a three-week visit to the USA last March, saying the Saudi king had made a "very wise decision" in choosing the prince to succeed him.
"We have always had a very good relationship", he said. "It's a bad thing".
The Post's report follows Defense Secretary James Mattis's remarks about Khashoggi's disappearance, in which he suggested the United States was keeping track of the developments. "We expect a thorough investigation and total transparency from the Saudi authorities on what happened".
Khashoggi had written a series of columns for the Washington Post that were critical of Saudi Arabia's assertive Crown Prince Mohammed bin Salman, who has led a widely publicised drive to reform the Sunni monarchy but has also presided over the arrests of activists and businessmen.
All three officials pressed MBS, as the Crown Prince is known, for more details and urged his government to support a transparent investigation, Sanders added.
White House Press Secretary Sarah Sanders confirmed Trump's comments about the ongoing talks between the two countries over the issue.
Trump said that he and First Lady Melania Trump were in contact with her and were looking to "bring her to the White House".
Mr Trump, who took his first overseas trip as U.S. president to the kingdom and whose son-in-law Jared Kushner has close ties to Prince Mohammed, said he had not yet talked to the Saudis about Khashoggi.
One of the 15 Saudis identified by name and photo in the report by Sabah newspaper is a forensic expert who has worked at the Saudi Interior Ministry for 20 years, according to a LinkedIn profile and Saudi media, and serves on the board of the Saudi Society of Forensic Medicine.
Turkey's Hurriyet newspaper and other media alleged Wednesday that the Saudi Consulate's 28 local staff were given leave on October 2 on grounds that a "diplomats' meeting" would be held there on that day.
The country has indicated it would allow Turkish authorities to carry out a search of the consulate.
Saudi Arabia was last night facing mounting global pressure to come clean over the disappearance of exiled journalist Jamal Khashoggi.
A critic of the crown prince, Mr Khashoggi was living in self-imposed exile in the United States and writing opinion pieces for the Washington Post before his disappearance. Asked if he thought Khashoggi was dead, he answered, "I hope he's not". Saudi Arabia denies this. Corker said he doubted accounts from Saudi officials that security cameras at the consulate did not record any images. "To me.it feels very much some nefarious activity has occurred by them. And we're going to get to the bottom of it", Trump said.
Turan Kislakci, a friend of Khashoggi and the head of the Turkish-Arab Media Association, said that Turkish officials said the journalist has been brutally murdered.
It did not say how it obtained the pictures and data.
Sen. Bob Corker (R-Tennessee) reportedly spoke to a Saudi ambassador about viewing security video that would show whether or not Khashoggi left the consulate. The New York Times and the Washington Post both reported that private planes carrying Saudi Arabian agents arrived in Istanbul shortly before and after Kashoggi entered the consulate and left the same day.
Boot told Lemon, "If these reports are accurate, they lured (Khashoggi) into their consulate in Istanbul on the soil of a North Atlantic Treaty Organisation country and killed and dismembered him".
It also shows groups of men arriving and later leaving Istanbul airport, as well as checking-in to a hotel. The footage shows Khashoggi entering the consulate on October 2.
Almost two hours later, the video shows two vehicles with diplomatic plates -a luxury black sedan and a black Mercedes VITO van- leave through the police barricades outside the consulate.