Turkish officials have said they believe a 15-member Saudi "assassination squad" killed Mr Khashoggi there. They provided no further details.
Khashoggi often wrote columns critical of Saudi Crown Prince Mohammed bin Salman, who has considerable weight in the actions of the Riyadh government. Speaking to reporters later in the morning, Mr. Trump suggested Khashoggi may have been murdered by "rogue killers" operating outside the authority of the Saudi government.
Turkish sources allege he was killed by a 15-strong team of Saudi agents, but Riyadh insists that he left the consulate unharmed.
They were published shortly after a report in the Washington Post - for whom Mr Khashoggi worked - cited USA government officials who believed that audio recordings proved he had been murdered while visiting the Saudi embassy. On Sunday, the oil-rich kingdom suggested retaliation if the USA were to impose strict measures.
"There needs to be a credible investigation to establish the truth about what happened, and - if relevant - to identify those bearing responsibility for the disappearance of Jamal Khashoggi, and ensure that they are held to account".
The search came after Turkish President Recep Tayyip Erdogan and King Salman also had their first telephone talks since the controversy erupted, in what appeared to be a conciliatory conversation according to official readouts. "We're going to get to the bottom of it, and there will be severe punishment". European allies have urged accountability for those responsible. And questions continue to swirl about his disappearance.
Its currency, the riyal, rebounded early on Tuesday after falling to its lowest in two years over fears that foreign investment could shrink amid global pressure.
Foreign capital is key to Saudi plans for economic diversification and job creation. The interrogation was meant to lead to his abduction from Turkey, the news channel said citing two unnamed sources. An Endeavor spokesman declined to comment on the report. CNBC reported that Mastercard CEO Ajay Banga would not attend either.
Relations between Canada and Saudi Arabia have been tense in recent months. Those policies are all seen as initiatives of Prince Mohammed, the son of King Salman, who is next in line to the throne. That's the distinction, it seems, this statement is going to make.
Tory MP Garnett Genuis pressed the government to condemn Saudi Arabia's election to the United Nations women's rights commission - the fourth time he's asked foreign affairs to do so, given that country's human rights record.
Trump quoted the King on Monday as saying that neither he nor his son, the crown prince, had any information about what had happened to Khashoggi.
Forensics tests like spraying luminol, a chemical mixture, can expose blood left behind, said Mechthild Prinz, an associate professor at the John Jay College of Criminal Justice who previously worked at the New York City's Office of the Chief Medical Examiner. We've all heard a lot about the audio.
"We got it. And we got all of it".