The US State Department said on Saturday that the government is "determined to hold all those responsible for the killing of Jamal Khashoggi accountable".
Investigators also believed that an operation such as the one that ended in Khashoggi's death would not have happened without Salman's knowledge given his control of the government, the official said.
A USA official says US intelligence agencies have concluded that Saudi Crown Prince Mohammed bin Salman ordered the killing in the Saudi Consulate in Turkey.
A day earlier, Trump spoke with the CIA chief on the agency's assessment of the killing of Khashoggi. Others familiar with the case say questions remain about what role he played. President Donald Trump told reporters today that he will be briefed on the conclusions by the Central Intelligence Agency on Air Force One with Secretary of State Mike Pompeo on his way to California to visit areas affected by wildfires.
Under pressure to punish Saudi Arabia for Khashoggi's death inside the Saudi consulate in Istanbul on October 2, Trump questioned the alleged role of Saudi Crown Prince Mohammed bin Salman, who is known as MbS and is the kingdom's de facto ruler.
Reporters asked Trump, as he toured fire damage in California on Saturday, about the death of Khashoggi, a columnist for The Washington Post and critic of the Saudi royal family.
The State Department says no final conclusions have been reached, although some US news accounts have reported that the Central Intelligence Agency has concluded that Saudi Crown Prince Mohammed bin Salman, Riyadh's de facto leader, ordered the killing.
He added: "We're going to have a report on Tuesday".
Spokeswoman for the Saudi Embassy in Washington Fatimah Baeshen denies the claims.
"I'm president - I have to take a lot of things into consideration", Trump said.
USA intelligence officials have concluded that Saudi Crown Prince Mohammed bin Salman ordered the killing of journalist Jamal Khashoggi.
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It contradicted the explanation made by Saudi officials that the body was rolled up in a carpet and handed to a local collaborator tasked with disposing of the evidence.
The Saudi government has denied that the son of King Salman was involved.
The situation has created a diplomatic dilemma for the U.S. president: How to admonish Riyadh for the killing yet maintain strong ties with a close ally in the Middle East.
US President Donald Trump said on Sunday he has been fully briefed on an audio recording related to the brutal killing of the dissident Saudi journalist Jamal Khashoggi, but was advised against listening to those "suffering" tapes.
On Thursday, Saudi Arabia's public prosecutor announced it would seek the death penalty for five of 11 suspects, even though Turkish leader Recep Tayyip Erdoğan said the killing was ordered at the "highest levels" of the Saudi government.
The president also said: "Will anybody really know?'"
He added: "We also have a great ally in Saudi Arabia".
The dismembered body of journalist Jamal Khashoggi may have been transported out of Turkey in luggage, according to the Turkish defense minister. "They may have taken out Khashoggi's dismembered corpse inside luggage without facing problems due to their diplomatic immunity", said Akar at an worldwide conference panel in Canada.
A day earlier he told reporters in California that it (Khashoggi's murder) was a awful thing that took place.