"Saudi authorities said they were open to cooperation and that a search can be conducted at the consulate building", the ministry spokesman Hami Aksoy said in a statement. "We want to find out what happened", Trump told the morning news program Fox & Friends.
After several of his friends were arrested, his column was cancelled by the al-Hayat newspaper and he was allegedly warned to stop tweeting, Mr Khashoggi left Saudi Arabia for the USA, from where he wrote opinion pieces for the Washington Post and continued to appear on Arab and Western TV channels.
"The president is conveying that he is not happy to hear these reports coming out of Istanbul, Turkey".
"He went in and doesn't look like he came out". I think there are other ways. "I don't like hearing about it", Trump told reporters at the White House. "I hope we won't encounter an undesirable situation". We know in the very near future.
He said it comes as no surprise that Riyad is looking to quash criticism, but this case is beyond the sad but true usual jailing of journalists.
Turkish officials say they believe Khashoggi was killed inside the consulate, and that a group of 15 Saudi nationals were involved in the murder.
The Washington Post, the daily to which Khashoggi was a contributor, added to the mystery by reporting Saudi Crown Prince Mohammed bin Salman had ordered an operation to "lure" the critical journalist back home.
The president did not provide details on a US investigation.
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Saudi officials talking to state media have said that the journalist left the consulate after his visit, denying the Turkish claims.
His comments were the latest sign of the outrage at Saudi Arabia that has been building steadily over the past nine days as graphic and disturbing details of Khashoggi's fate have emerged. It has offered no evidence to support its claim the writer simply walked out of its consulate and vanished despite his fiancée waiting outside for him.
President Donald Trump says he's reluctant to slash weapons sales to Saudi Arabia, saying that if the US doesn't sell arms to the kingdom, then the Saudis will buy them from Russian Federation or China.
But the disappearance of the journalist, however prominent, may not affect President Trump's bet on the Saudi heir to the throne. But Trump is expressing reservations over calls to withhold further USA arms sales to Saudi Arabia.
Meanwhile, the United Nations human rights office urged both countries to investigate the case.
He said then that Saudi Arabia is before "serious transformation that is going to involve and affect every Saudi".
Saudi Arabia said the allegations were baseless. Hunt said he had spoken to Saudi Foreign Minister Adel al-Jubeir and had told him "how very, very concerned the United Kingdom is".
"Part of that is what we're doing with our defence systems and everybody's wanting them".