Earlier Friday, Turkish prosecutors questioned staff at the Saudi Consulate, state media said, suggesting attempts to strengthen a possible criminal case with insider details from the last place journalist Jamal Khashoggi was seen alive.
The Saudi government has released an explanation of how they believe journalist Jamal Khashoggi died at the Saudi consulate in Istanbul, Turkey.
Trump, who said on Thursday he believes Khashoggi is likely dead and has warned of a potential "very severe" response.
"The claim that Khashoggi was killed while brawling with 15 men dispatched from Saudi Arabia is not at all credible".
Saudi public figures have taken to Twitter to express support for authorities' handling of the Khashoggi affair, while newspapers in the kingdom have condemned a "media campaign" against it.
Saudi Arabia, the president said, "has been a great ally in the Middle East". It's also an about-face from the kingdom's previous denials of any involvement in Khashoggi's October 2 disappearance at the consulate.
The U.S. Congress is controlled by Trump's fellow Republicans, some of whom have called for tough action against Saudi Arabia.
Khashoggi, a critic of the Saudi royal family, went missing after entering the consulate on October 2 to obtain documents for his upcoming marriage.
Tennessee GOP Sen. Bob Corker complained that the Saudi explanation for Khashoggi's disappearance "continues to change with each passing day, so we should not assume their latest holds water". "Khashoggi's Turkish fiancée, Hatice Cengiz, tweeted in Arabic: "The heart grieves, the eye tears, and with your separation we are saddened, my dear Jamal", she said, also asking "#where is martyr Khashoggi's body?"
But this morning, Saudi Arabia said an investigation had found Khashoggi died in a fight inside the consulate and that 18 Saudis had been arrested in connection with the incident.
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President Donald Trump, speaking at a defense roundtable in Arizona on Friday night, called the Saudi report a "good first step". The suspects then attempted to "conceal an cover" what happened, the statement read.
The agreement saw the United States guarantee military protection for the kingdom in return for privileged access to oil reserves, which were discovered in enormous quantities in the 1930s.
"After the recognition of Khashoggi's death, we expect a determined, constant and powerful pressure to be kept on Saudi Arabia in order to get the whole truth on the case and the release of Saudi Arabian journalists (who have) been condemned to insane and disgusting sentences". The statement also did not shed any light on what happened to Khashoggi's body after his death.
The kingdom at the same time announced the firing of four top intelligence officials, including Maj.
However Saud al-Qahtani, the royal court adviser, has been ousted after the country's own investigation.
Assiri had no immediate comment.
"To say that I am skeptical of the new Saudi narrative about Mr. Khashoggi is an understatement".
Government-run state media said a fight broke out between the journalist and people he met there.
This, the statement added, "resulted in the formation of the Joint Investigation Team between the Kingdom and the Republic of Turkey and the permission to the Turkish authorities to enter the premisses [sic] of the Consulate of the Kingdom in Istanbul and the residence of the consul, for the Kingdom keenness to know all the facts".