Reports also said on October 24 that Saudi authorities had denied permission for Turkish police to search a well in the consulate's garden.
Members of Congress have demanded that sanctions be imposed on Saudi Arabia over the killing of Khashoggi, who lived in self-imposed exile in the US and wrote critically about Saudi Crown Prince Mohammed bin Salman.
Slain journalist Jamal Khashoggi's body has been found in a well at the Istanbul residence of the Saudi consul general, according to Turkish politician Dogu Perincek.
The administration "will continue to hold those responsible accountable".
Trump told reporters that Erdogan was pretty tough on Saudi Arabia. The case has strained relations with the U.S. and other allies.
A 15-person team made up of senior Saudi officials meticulously planned the operation before his "gruesome" murder, including the use of a body double to falsely suggest Khashoggi had left the building alive, Mr Erdogan said.
The crisis overshadowed the crown prince's high-profile economic forum, aimed at raising much needed investments to underwrite his plans to overhaul the Saudi economy.
Khashoggi, a United States resident who wrote for the Washington Post, had gone to the consulate to get papers for his upcoming wedding.
The tough questions posed by Erdogan were questions that he surely expects Kings Salman of Saudi Arabia to ask of his son.
The fallout has damaged Saudi Arabia, badly tarnished Crown Prince Mohammed bin Salman and raised questions about United States foreign policy priorities that hinge on the kingdom's financing or cooperation.
He described it as a "political murder" but stopped short of blaming the crown prince, saying: "Intelligence and security institutions have evidence showing the murder was planned".
France will take "appropriate" punitive measures if Saudi Arabia's guilt in Khashoggi's killing is clearly established, a French government spokesman said Wednesday.
He said 18 suspects detained by Saudi Arabia should be extradited to Istanbul to face trial over the killing and called for an investigation into those with "even the slightest link" to the case. "I want to assure the American people we're going to get to the bottom of it", he said.
On Thursday, Saudi state Ekhbariya TV quoted the Saudi public prosecutor as saying Khashoggi's murder was premeditated, and that prosecutors were interrogating suspects on the basis of information provided by a joint Saudi-Turkish task force. Peter Navarro, Trump's White House trade chief and architect of his "Buy American" policy to ease restrictions on foreign arms sales, has been a significant voice during the Khashoggi affair in reinforcing to the president the importance of Saudi weapons deals and the US job implications, a senior USA official told Reuters, speaking on condition of anonymity.
Taking aim at the inconsistent position of Riyadh in the days after the murder he added: "Why when the murder was clear, why were so many inconsistent statements made?" But their back-channel relationship unnerved many in the Trump administration and Washington foreign policy establishment who feared that the White House was betting too big on the crown prince.
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