He added: "We're going to try getting to the bottom of it very soon, but his was a flat denial".
Saudi journalist Jamal Khashoggi is still missing, almost two weeks after he entered the Saudi Arabian Consulate in Istanbul.
Trump tweeted early Monday that Salman denied any knowledge of "whatever may have happened 'to our Saudi Arabian citizen'".
The FO spokesman responding to a query about Pakistan's stance on the issue said: "We understand that the investigation was ongoing and it would therefore be appropriate to await the outcome". "And he firmly denies that".
Flake said if the Saudis did, in fact, kill Khashoggi, Congress might specifically curtail US military aid to Saudi-led forces in Yemen.
Three high-profile Wall Street CEOs reportedly attempted to persuade Saudi officials to push back Saudi Arabia's Future Investment Initiative conference.
U.S. Must ‘Push Harder for the Truth’ About Journalist Jamal Khashoggi
On Tuesday, a Turkish Foreign Ministry official acknowledged police want to search the Saudi consul's home as well. Three others are linked by witnesses and other records to the Saudi crown prince's security detail.
They entered the building on the day when a team of investigators, put together by Ankara and Riyadh, were to search the consulate where Turkish authorities claim Saudi dissident journalist was killed. Saudi Arabia, meanwhile, said King Salman thanked Erdogan "for welcoming the kingdom's proposal" for forming the working group.
Turkish officials also claimed that some of those 15 Saudi men had high-level connections in the Saudi government. The president of the United States said something flat-out nutty, and our major news organizations treated it like normal news, slapping it into the headlines and passing it along to their readers with little more than the standard, buried "critics said" response.
His comments came as Saudi Arabia was last night said to be preparing to admit that Mr Khashoggi died as a result of an interrogation that went wrong, according to reports in the US. It was unclear whether there would be much of anything to investigate forensically, given that so much time has passed since Khashoggi was last seen.
Media captionCCTV footage shows missing Saudi journalist Jamal Khashoggi entering the Saudi consulate in Istanbul.
"The Kingdom affirms its total rejection of any threats and attempts to undermine it, whether by threatening to impose economic sanctions, using political pressures, or repeating false accusations", the official state-run Saudi Press Agency said on Sunday.
But in the wake of Khashoggi's disappearance, many media and entertainment companies have been distancing themselves from the kingdom.
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