"Unfortunately, there has been this hysteria in the media about Saudi Arabia's guilt before the investigation is completed", he said. The Saudi leadership has pushed responsibility down the chain of command.
Mr Trump has called the case "one of the worst cover-ups in history".
"I perceived it as a statement to win the sympathy of the public".
"I still have questions that I can not answer", said Cengiz, who shed tears at times in the interview.
Khashoggi, a Washington Post columnist who has written critically of the kingdom's leadership, went missing after entering a Saudi consulate in Istanbul on October 2.
The Committee to Protect Journalists, meanwhile, has called for "an global investigation and relentless pressure on Saudi Arabia from the Trump administration, if we ever hope to get to the truth". "They're detained in Saudi Arabia, and the investigation is in Saudi Arabia, and they will be prosecuted in Saudi Arabia", Foreign Minister Adel al-Jubeir told a regional defence forum in Bahrain. In a telephone call Friday, the two agreed on the need for "all aspects of the murder" to be exposed and for the killers to be brought to account, the officials said.
Salah Muhammad al-Tubaigy, a former Glasgow University student, is one of 15 people linked to the death of Jamal Khashoggi, a critic of Crown Prince Mohammed bin Salman. In the past, military exports by Berlin to Saudi have mostly consisted of patrol boats.
She told Haberturk she never would have let Khashoggi enter the consulate if she had thought that Saudi "authorities would hatch a plot" to kill him.
Media captionJamal Khashoggi: What we know about the journalist's disappearance and death What else did his fiancée say?
His comments calmed skittish oil markets.
Even previously friendly Republicans are now calling for sanctions and an arms embargo as the truth emerges about the authorities' role in the killing.
"This is an approach by Trump we are used to", the interviewer interjected. But there has been no EU-wide push for an embargo. "Otherwise, change would happen so quickly that our heads would spin", he said.
"We will overcome" the consequences of the Khashoggi killing, he added.
He said that the kingdom will hold those responsible accountable and put mechanisms in place to ensure this doesn't happen again.
The writer's fiancee later said she had not received any condolence call from Saudi officials.
"Whoever thought of that idea I think is in big trouble - and they should be in big trouble". "But his statements were at very short intervals and they were contradictory".
Saudi Arabia's foreign minister has described the kingdom as a "vision of light" in the region as it tries to control the fallout from Jamal Khashoggi's killing - its biggest diplomatic crisis since the 9/11 attacks. Turkish investigators - who are still looking for the body - believe he was tortured and dismembered.
Prince Mohammed, the heir apparent to the kingdom's throne, has denounced the "repulsive" murder, denying any involvement. The Post reported Wednesday that Haspel had listened to the tape, which Khashoggi reportedly recorded himself on his Apple Watch. "The question is how do we defeat them".
"It is not that we don't have any other information or documents".
"Nobody should rule out the price jumping to $100 and $200 a barrel or maybe double that figure", warned Mr al-Dakhil, an ally of the Saudi royal court.