The killing torpedoed a powerful PR campaign led by the crown prince to show that the conservative Islamic state has embarked on a new reformist path.
The gruesome murder of Khashoggi, who vanished after being lured into the Saudi consulate in Istanbul on October 2, has hugely embarrassed Washington. After spending two and a half months outside of the kingdom, in what some suggested was a self-imposed exile, Prince Ahmed returned to the kingdom last month as the news surrounding Khashoggi's murder drew worldwide criticism.
The United States has refrained from blaming the crown prince for the murder.
Saudi King King Salman bin Abdulaziz al-Saud heaped praise on the kingdom's judiciary on Monday, in his first public remarks since Jamal Khashoggi's murder tipped the country into one of its worst worldwide crises.
"We may never know all of the facts surrounding the murder of Mr. Jamal Khashoggi".
The president said that "representatives of Saudi Arabia say that Jamal Khashoggi was an "enemy of the state" and a member of the Muslim Brotherhood".
Saudi prosecutors said last week that the crown prince, Saudi Arabia's de facto ruler, knew nothing of the operation, in which Khashoggi's body was dismembered, removed from the building and handed over to an unidentified "local cooperator".More news: USA utility stocks slump as California wildfires leave hundreds missing
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Turkish President Recep Tayyip Erdogan has said the "highest levels" of the Saudi leadership were behind Khashoggi's killing.
Former FBI agent Josh Campbell argued that, despite Trump's claims to be putting "America first", his actions endanger everyone.
He said the United States intends to remain a steadfast partner of Saudi Arabia to ensure the interests of the United States.
Although the Central Intelligence Agency is not said to have direct evidence linking Mohammed bin Salman to the murder, officials reportedly believe it could not have taken place without his approval. He said that the president's chief concern was American safety.
Trump then went on to say that congress is "free" to "go in a different direction" on Saudi Arabia, but that he will only consider ideas "consistent" with United States security.
Saudi Arabia's top prosecutor is seeking the death penalty for five suspects charged with ordering and carrying out the killing of dissident Saudi writer Jamal Khashoggi. The official said the government's reporting was being updated daily.
The four men, said to be members of a Saudi "hit squad", then removed the writer to another area of the consulate that contains administrative offices, where sounds of a quarrel, beating and torture are heard on another four-minute recording.