"The United States intends to remain a steadfast partner of Saudi Arabia to ensure the interests of our country, Israel and all other partners in the region", the president added, noting Saudi investments in USA military equipment and other contracts.
In a previous statement, Graham also said that the Crown Prince is "toxic" to U.S. - Saudi relations. "All we can say is that Mohammed bin Salman's attendance remains confirmed, we have received no contrary information so far", the source told the Guardian.
The prince, a former Saudi intelligence chief who has also served as ambassador to the United States, said the CIA's conclusion that Iraq possessed chemical weapons before the USA invasion in 2003 showed it could be unreliable. This is not an ally that deserves this kind of military intervention, especially because there's been no connection between the safety of the American people and our involvement in this war.
Intelligence officials have said the CIA presented the President with a confidence-based assessment given the facts of the situation.
"It telegraphs to despots around the world they can murder people with impunity and that this president will have their back as long as they praise him, as long as they do business with him potentially, " Schiff added.
The CIA has concluded that Prince Mohammed ordered the operation to kill Khashoggi last month - as first reported by the Washington Post - and has briefed other parts of the USA government on its findings, sources told Reuters last week.
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Numerous U.S. lawmakers have said they intend to push for U.S. sanctions against Saudi Arabia because of Khashoggi's killing.
After an overnight stay in Cairo, the crown prince is due to travel to Tunisia where protests against the visit have been organised for Tuesday. Joni Ernst of Iowa said on CNN's "State of the Union" on Sunday.
The Trump administration has imposed sanctions on 17 individuals that Saudi Arabia said were connected in Khashoggi's death. Questions still remain over how strongly Congress should respond in attempting to punish the Saudi crown prince, Mohammed bin Salman, over the murder.
Ernst also said she'd "tend to be with my colleagues" in demanding congressional action against the Saudis.
FILE - Sen. Ben Sasse, R-Nebraska, returns to a Senate Judiciary Committee hearing after a break on Capitol Hill in Washington, Sept. 27, 2018.
Lee was speaking in an interview on NBC News on November 25 in response to Trump's Thursday remarks that the Central Intelligence Agency "did not come to a conclusion" about Mohammed bin Salman's involvement in the murder.