Trump dispatched Secretary of State Mike Pompeo to meet King Salman over the case that has strained the Americans' relationship with the Saudis, carefully cultivated by the U.S. president.
U.S. Secretary of State Mike Pompeo traveled to Saudi Arabia to talk to King Salman and the 33-year-old crown prince about the fate of the journalist who wrote critically about the Saudis for the Washington Post.
But she also dropped a strong hint that she has no regrets about the very public tweet that raised the ire of Saudi rulers.
Trump has taken a less aggressive stance toward the Saudis, suggesting on Monday after speaking with Saudi King Salman that perhaps "rogue killers" were behind the disappearance of Khashoggi, a sharp critic of the crown prince.
Turkish officials have also provided several USA media outlets with passport scans of seven men suspected of being involved in Khashoggi's disappearance - several of whom have links to Saudi Crown Prince Mohammed Bin Salman.
Following Trump's comments about the possibility that "rogue killers" might have been involved, several U.S. media outlets reported that a Saudi probe was expected to paint Khashoggi's death as a result of a botched rendition and interrogation.
The UN human rights chief called Tuesday for the lifting of the immunity of officials who might be involved in Khashoggi's disappearance.
A pro-government Turkish daily published preliminary evidence last week from investigators who it said had identified a 15-member Saudi intelligence team that arrived in Istanbul on diplomatic passports hours before Khashoggi disappeared. "Boeing, Lockheed, Raytheon, all these - I don't want to hurt jobs", Trump said. "I don't want to get into his mind, but it sounded to me like maybe these could have been rogue killers".
Riyadh's most recent comments have focused on having no knowledge of any killing or denying any such order had been given.
Even if you set aside Trump's repeated emphases that the Saudis deny wrongdoing - which is a Trump tell if there ever was one - his comments betray an apparent willingness to float and parrot Saudi talking points in a way that shouldn't escape notice.
But the U.S. president also said "rogue killers" could be behind the disappearance and that King Salman had told him Saudi Arabia is "working closely with Turkey to find answers".
After his meeting with Pompeo, the Turkish Foreign Minister said the investigation at the Saudi Consul's residence in Istanbul will continue along with all consular vehicles.
Turkish President Recep Tayyip Erdogan told reporters the investigation "was looking into many things such as toxic materials and those materials being removed by painting them over".
On Tuesday, Pompeo landed in Riyadh to meet with King Salman to discuss Khashoggi's disappearance.
He added that the search of the residence would take place only when there is a joint agreement with Riyadh.
In a major new blow for the event, JPMorgan Chase CEO Jamie Dimon and Ford chairman Bill Ford also cancelled plans to attend as well as Larry Fink, the head of investment giant BlackRock, and Steve Schwarzman of Blackstone.
"I think we'll also be guided by what other countries are doing", he said. A Saudi official said the kingdom has begun an investigation ordered by the king and could hold people accountable if evidence warrants it. "Who knows? We're going to try getting to the bottom of it very soon".
Trump earlier threatened "severe punishment" if it is proven that Khashoggi was killed in the consulate.