In an interview scheduled to air today, Mr Trump told CBS' 60 Minutes that Saudi Arabia would face strong consequences if involved in Mr Khashoggi's disappearance.
Khashoggi, a Washington Post columnist, was last heard from on October 2 after entering the Saudi consulate in Istanbul to gather some documents for his upcoming wedding.
The source said the Kingdom's government and its people are steadfast, glorious as ever, no matter whatever the pressures and circumstances might be.
In the diplomatic fallout over Khashoggi's disappearance, global firms are pulling out of a high-profile investment summit due to take place later this month in Riyadh.
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The exchange dropped by over 500 points, then clawed back some of the losses, ending the day down 264 points, or more than 4 per cent.
The index suffered its biggest intraday decline since December 2014, when oil prices were crashing, with the Gulf region's biggest petrochemical producer, Saudi Basic Industries, tumbling as much as 7.9 percent, Reuters said. If materialized, the IPO will be a historic event in Silicon Valley and a huge payday for Uber's major investors, most notably the Saudi royal family and the SoftBank Vision Fund, according to Wall Street's latest estimate of the ride-hailing giant's worth.
Khashoggi's fiancée Hatice Cengiz revealed how the couple spent their last hours together, writing that "tyrants eventually pay for their sins", in a New York Times article on Saturday. "We're going to get to the bottom of it, and there will be severe punishment". "When we arrived at the consulate, he went right in". "We would have been married now".
The director-general of the worldwide monetary Fund (IMF), Christine Lagarde, said on Saturday "horrified" by the case Khashoggi, but has confirmed his participation at the meeting organized by Riyadh.
But rather than a dissident, he saw himself as a patriot "using his pen for the good of his country", she said.
Turkey says it believes he was killed inside, telling USA officials that it has audio and video recordings from his final moments to prove it. Saudi Arabia has vehemently denied having anything to do with the disappearance.