In a statement released in late-November, Trump said he plans on maintaining a good relationship with Saudi Arabia and it's crown prince.
"But this is not only the case of Turkey, but of the whole world".
"Right now, we do not have a smoking gun", he said, noting that he had seen all the latest intelligence in the matter as of Friday.
US Secretary of State Mike Pompeo walks with Saudi Foreign Minister Adel al-Jubeir in Riyadh, Oct. 16, 2018.
US President Donald Trump sought to cast doubt on the CIA assessment that the prince ordered Khashoggi's killing, telling reporters the agency had not formed a definitive conclusion.
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The crown prince conveyed King Salman's greetings to the Mauritanian leader, SPA said.
But the intelligence agency has "medium-to-high" confidence that Prince Mohammed "personally targeted" the journalists and "probably ordered his death".
The G20 was the first time Prince Mohammed came face-to-face with the world's most powerful leaders since the killing of Khashoggi in October.
Middle East Eye previously reported that Khashoggi was dragged from the consul-general's office in the consulate onto the table of his study next door where it took seven minutes for him to be killed.
Following the global outcry after Khashoggi's death, all eyes are on the Saudi prince at the G20 summit.
The Organization of the Petroleum Exporting Countries, of which Saudi Arabia is a key member, and Russian Federation and other leading oil producers will meet in Vienna on Dec 6-7 to discuss the oil market, as prices have been declining due to oversupply.
The visit is also expected to boost various bilateral workshops emanating from the 13th Algerian-Saudi Joint Committee held in Riyadh in April, which resulted in the signing of several cooperation agreements.
After initially denying the murder, Saudi Arabia acknowledged some liability but blamed his death on a "rogue" operation.