Turkish authorities have said they have an audio recording which indicates that Mr. Khashoggi was killed in the consulate.
Trump paid his first foreign visit as president to Saudi Arabia previous year, praised its new young ruler, the king's son Prince Mohammed, and boasted of striking a deal to sell $110 billion (€95 billion) of U.S. weapons to the kingdom, something the president said he doesn't want to halt over the missing reporter, because it would hurt the United States economy.
Significantly, it was expected to showcase the reform agenda of Saudi Crown Prince Mohammed bin Salman. He didn't make any remarks to the media. America's top diplomat thanked the king "for accepting my visit on behalf of President (Donald) Trump" before going into a closed-door meeting. Most experts say that probably won't happen.
"Been hearing the ridiculous "rogue killers" theory was where the Saudis would go with this", Sen. "Who knows?" the President said, describing the situation as "terrible". We need answers from the Saudis about Jamal Khashoggi's disappearance.
However, left unsaid was the fact that any decision in the ultraconservative kingdom rests exclusively with the ruling Al Saud family.
Trump also said he told the king: "The world is watching".
The person said Prince Mohammed had approved an interrogation or rendition of Mr. Khashoggi back to Saudi Arabia.
One source cautioned that the report was still being prepared and could change, CNN said.
The Saudi Embassy in Washington also canceled its National Day party, which was scheduled for Thursday.
For many years, the notion that Khashoggi would turn into the Saudi regime's most-wanted opponent would have seemed inconceivable as he built a career as a journalist and an operative in close connection to the Saudi ruling establishment.
Turkey had wanted to search the consulate for days.
Azzam Tamimi, an Islamist friend of Khashoggi, called the "rogue" theory "disastrous" for the credibility of President Recep Tayyip Erdogan of Turkey. In statements after the call, both praised the creation of a joint Saudi-Turkish investigation.
What evidence Turkish officials could gather at the consulate remained unknown.
What evidence Turkish officials gathered at the consulate remains unknown.
The forum will be held on October 23-25 and hosted by Saudi Arabia's Public Investment Fund.
On Tuesday, a Turkish Foreign Ministry official acknowledged police want to search the Saudi consul's home as well.
A Saudi delegation had entered the consulate one hour before the Turkish police arrived and appeared still to be inside as the search was conducted.
The Foreign Ministry official spoke on condition of anonymity in line with government regulations.
Meanwhile, The Washington Post and Politico reported that two lobbying groups - BGR and Glover Park - have said that they would no longer represent Saudi Arabia. And that leads to the question, could Mohammed bin Salman lose his job as crown prince?
Khashoggi moved to Washington after Crown Prince Mohammed began a kingdomwide anti-corruption crackdown, including efforts to silence dissidents. Some U.S. companies that had planned to attend the conference, including The New York Times, have pulled out since Khashoggi's disappearance.
"It should be a known fact that the Arabs never had a problem with antisemitism, but we need to state that over and over again", Khashoggi added, justifying the surprising Saudi presence at the event.
Saudi state owned Al-Arabiya news channel delivered a bullish message to the U.S. and the global community in response to growing calls for sanctions against Riyadh over the disappearance of journalist Jamal Khashoggi.