He initially said he believed the Saudi account.
Speaking on Fox News Saudi Foreign Minister Adel al Jubeir on Sunday said, "We are determined to punish those who are responsible for this murder".
"The individuals who did this did this outside the scope of their authority", he said. Turkish officials suspect a team of Saudi agents was sent to assassinate him.
President Trump had also talked about possible punishment but said he didn't want to halt a proposed $110 billion arms sale to Saudi Arabia because, he maintained, it would harm USA manufacturers.
That yet again adds to the pressure Saudi Arabia faces over the slaying of the Washington Post columnist.
"It's my thinking that MBS was involved in this, that he directed this and that this person was purposefully murdered", Sen.
"The circle is tightening around the crown prince", said one of its headlines.
Tennessee Republican Bob Corker says that based on his briefings he believes the royal known as MBS was behind the killing of the Saudi critic.
During an appearance Sunday on NBC's "Meet the Press", Sen.
The incident has damaged the kingdom's image as a future investment hub, with global business leaders from Goldman Sachs Group Inc.to Uber Technologies Inc. distancing themselves from Prince Mohammed and scrapping plans to attend his business forum this week.
"Even the senior leadership of our intelligence service was not aware of this", he said, calling it a "rogue operation".
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German Foreign Minister Heiko Maas said on Saturday that he saw "no basis for decisions in favour of arms exports to Saudi Arabia".
"There is no intention", Khalid Al Falih told Russia's TASS news agency when asked whether there could be a repeat of the oil embargo.
"Their stories are all over the place", he said, but emphasized the importance of US-Saudi relationship to Washington's regional strategic goals. "And what happened subsequent to that".
Turkish officials said a 15-member Saudi team flew to Istanbul, waited for Khashoggi at the consulate before killing and dismembering the 59-year-old writer. An hour later, another Saudi official attributed the death to a chokehold, which the senior official reiterated.
It also said 18 people had been arrested as part of the case. Our condolences go out to them. "There was no order for a killing". Saudi Arabia so far has not acknowledged or explained Mutreb's presence in Istanbul - nor that a forensics and autopsy expert was also on hand for Khashoggi's arrival at the consulate.
Saudi Arabia denied any knowledge of his fate for two weeks.
The change indicated Qahtani would still retain significant influence in the Saudi effort to track dissidents online and disseminate official messages via a highly coordinated social-media strategy. The friend spoke on condition of anonymity for fear of repercussion.
Investors around the world have pulled $650m in funds from Saudi Arabia over the last week and the pain is unlikely to stop anytime soon as the diplomatic dispute over the disappearance of journalist Jamal Khashoggi heats up.
Trump chose Saudi Arabia as his first overseas trip as president, and his son-in-law and adviser Jared Kushner has developed close ties with Prince Mohammed, apparently seeing him as an ally in advancing his yet-to-be-released peace plan for Israel and the Palestinians.
During a joint interview with Britain and France, Mrs Merkel said that she condemned the killing of Mr Khashoggi "in the strongest terms".