Mr Khashoggi, who has been critical of some policies of Mohammed bin Salman, has lived in self-imposed exile in the United States since a year ago to avoid possible arrest.
Prince Mohammed said that the kingdom could push capacity beyond 12 million barrels a day with additional investment, and that extra supplies are also available from Saudi Arabia's allies. "To do otherwise would betray those who languish in prison".
On Friday, supporters of Mr Khashoggi gathered outside the Saudi consulate in the city's Besiktas district calling for his "release" despite Riyadh's denials that he was being held inside. "Jamal Khashoggi's disappearance is a matter of grave concern to us all", he wrote on Twitter.
That's the approach the Washington Post took today, as the United States newspaper left a blank slate on its Opinion page to draw attention to the disappearance of Saudi journalist and Post contributor Jamal Khashoggi.
Khashoggi has been missing since he entered the Saudi consulate in Istanbul this Tuesday. Hamza Zawba, an Egyptian journalist, said as colleagues held Khashoggi's portrait aloft behind him.
Turkey has said it believes Khashoggi is still inside the consulate.
The Saudi Arabian consulate in Istanbul, Turkey, seen on October 3, 2018. We want to keep our journalism open and accessible and be able to keep providing you with news and analyses from the frontlines of Israel, the Middle East and the Jewish World. He entered the building of the consulate, he has to come out of there safe and sound.
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Human Rights Watch called on Ankara to "deepen their investigation" into the journalist's whereabouts, saying his possible detention could "constitute an enforced disappearance" in a statement late Thursday.
At a rally in MS earlier this week, President Trump bragged about putting his foot down with Saudi Arabia's King Salman and demanding more military spending, following accusations that he and other OPEC nations are "ripping off the rest of the world".
A group representing Turkish-Arab journalists on Friday voiced solidarity with one of their own who is missing, fate unknown.
"Yesterday the Saudi ambassador was summoned to the foreign ministry and the issue of Khashoggi was discussed", one of the sources said.
His Turkish fiancée, Hatice, who had also gone with him to the consulate, told the media that she was not allowed to go inside with him. "We call on the Saudi authorities to release Jamal, or to tell us, where is he?"
"Right now we have no information".
Khashoggi's fiancée, who asked that her name be withheld, said he entered the consulate at around 1 p.m. local time (1000 GMT) on Tuesday, as she accompanied him but waited outside. What does Trump's comment reveal about Saudi Arabia's sovereignty and independence?