Crown Prince Mohammed told Jared Kushner, Donald Trump's son-in-law, and John Bolton, the president's national security advisor, that Mr Khashoggi was a member of the Muslim Brotherhood, according to the Washington Post.
The Saudi government has said it will carry out a thorough and transparent investigation and that the suspects will be prosecuted in Saudi Arabia. "It would affect the entire region".
Exactly one month after the disappearance and the subsequent murder of the Washington Post columnist inside the Saudi consulate in Istanbul, the United States has yet to issue the "severe punishment" that Donald Trump had promised if the regime's involvement in the journalist's death were confirmed.
Saudi Crown Prince Mohammed bin Salman told the USA he considered murdered writer Jamal Khashoggi to be a unsafe Islamist, media reports say.
Saudi Arabia has maintained for years that normalising relations with Israel hinges on its withdrawal from Arab lands captured in the 1967 Middle East war - territory Palestinians seek for a future state.
"We won't leave Khashoggi's murder behind".
"In accordance with plans made in advance, the victim, Jamal Khashoggi, was strangled to death immediately after entering the consulate-general of Saudi Arabia in Istanbul on 2 October, 2018 for marriage formalities", chief prosecutor Irfan Fidan said.
The crown prince stated Khashoggi was a member of the Muslim Brotherhood, prior to Saudi Arabia formally acknowledging it was responsible for the journalist's death.
His body has not been found, although Turkish police last month searched a forest on Istanbul's outskirts and near Yalova, a city near the Sea of Marmara, for Khashoggi's remains. "He denied such claims repeatedly over the past several years", the statement said. "To claim otherwise would be ridiculous".
Turkey is trying to extradite 18 suspects detained in Saudi Arabia so they can be tried in a Turkish court. Turkish President Recep Tayyip Erdogan has also called on Riyadh to disclose the identity of an alleged local collaborator said to have been involved in disposing of Khashoggi's body.
The White House was aware of the crown prince's hostility to Khashoggi, a Virginia resident and columnist for The Washington Post, as early as October 9.
A source close to the Saudi Royal Palace told CNN last week that the location of Khashoggi's body was not known to the Saudis.