"Our expectation is that in making your determination you will consider any relevant information, including with respect to the highest ranking officials in the government of Saudi Arabia".
"We don't know what happened", he said.
"We need to take some type of action, and there are some things we can do congressionally", he said.
"We're demanding everything. We want to see what's going on there".
A Twitter thread claims to have matched several of the identities of the "hit squad" released by Turkish media with men in Saudi Arabia that are allegedly part of Saudi Arabia's security forces or government employees.
Saudi officials have denied Kashoggi was killed within the consulate and say he left shortly after arriving to retrieve a document related to his upcoming wedding.
The Saudi consulate and other authorities have not commented on the claims.
The Post has obtained video of the areas surrounding the consulate that purportedly shows when Khashoggi arrived at the consulate, as well as the movements of vehicles leaving the consulate two hours later.
Under pressure from Congress, the Trump administration faces a dilemma: how to respond to the disappearance of Saudi journalist Jamal Khashoggi while ensuring that any punitive action does not alienate Riyadh, a key ally against Iran. There is no footage that shows him leaving, they said.
Anonymous Turkish sources say the 15 men flew into Istanbul of two private Gulfstream IV jets with tail numbers HZ-SK1 and HZ-SK2. The video shows aircraft waiting on the tarmac.
"This much is true: He entered the consulate, and there's no proof that he came out", wrote Hatice Cengiz.
A surveillance video image surfaced Tuesday showing Khashoggi walking into the consulate in Istanbul's upscale 4th Levent neighborhood.
The disappearance of journalist Jamal Khashoggi on Wednesday prompted senators to initiate an investigation and possible sanctions against Saudi Arabia. "They can even catch bird or a mosquito with the advanced systems they have", the president said.
They haven't searched the consulate yet, as they have promised to do. Trying to stay calm, I immediately called Yasin Aktay, an adviser to Turkish President Recep Tayyip Erdogan and one of Jamal's oldest friends. So far, I'm told, the Saudis haven't been co-operating - hence Ankara releasing the names of the Saudi alleged hit squad on Wednesday. "Jamal Khashoggi is a Virginia resident, so his disappearance is personal to me". Saudi Arabia has dismissed the allegations as "baseless". But this is not simply one side's word against the other.
His fiancee appealed to Trump to assist in efforts to find him Tuesday, penning an opinion piece in the Washington Post newspaper.
A former editor of the al-Watan newspaper, he was for years seen as close to the Saudi royal family. Saudi officials haven't acknowledged that.
It's not clear from the intercepted communications if the Saudis planned to abduct or kill Khashoggi and whether the U.S. had warned the Saudi journalist.