Donald Trump, the United States president, said he had raised Mr Khashoggi's case with Saudi Arabia "at the highest level" and a couple of times in recent days. It could pave the way for sanctions, including against high ranking officials in the Saudi government.
Decades of close U.S. -Saudi relations, which have only intensified under Trump, appeared in jeopardy by the suggestion of a carefully plotted murder of a government critic, Jamal Khashoggi, 59, who disappeared a week ago after entering a Saudi consulate in Turkey.
Khashoggi hasn't been seen since then, and Turkish officials are alleging that he was murdered inside the Consulate on orders from Saudi Arabia's government. Saudi Arabia denies knowing anything about his fate, saying that he left the building. He had already applied to become a United States citizen, according to an op-ed in the Post by his Turkish fiancee Hatice Cengiz, who was waiting for him outside the consulate on 2 October when he disappeared.
That same day, President Trump was asked about Khashoggi's disappearance and didn't have much to say apart from "I am concerned about it". "We want to see what's going on. I mean, you're affecting us and, you know, they're always quick to jump that way".
"We can not let this happen, to reporters, to anybody", Trump said.
A citizen of Saudi Arabia, Khashoggi served as editor of multiple Saudi newspapers including Arab News and Al Watan.
"The Saudis have a lot of explaining to do because all indications are that they have been involved at minimum with his disappearance", Corker told The Associated Press. Bob Corker of Tennessee that they "only livestream their tapes".
The Washington Post reported on Tuesday that USA intelligence had intercepted the communications of Saudi officials discussing a plan to capture Khashoggi, citing an unidentified person familiar with the information.
According to security sources the preliminary estimations of the Turkish police suggest that Khashoggi was killed at the Saudi consulate in Istanbul, that the killing was planned and the body of Khashoggi was taken out of the consulate.More news: Spock appears in first 'Star Trek: Discovery' Season 2 trailer
They reportedly took CCTV footage from the consulate with them back to Riyadh, while Turkish staff at the consulate were told to take holiday the day Khashoggi arrived.
The videos show one of two private jets arriving at Istanbul's Ataturk Airport early in the morning on October 2, the date Khashoggi disappeared after entering the consulate to arrange papers for a marriage.
What else does the video show?
Turkish Foreign Ministry spokesman Hami Aksoy said Tuesday that Saudi authorities have notified Ankara that they were "open to cooperation" and would allow the consulate building to be searched.
About two hours later Aksam showed two vehicles, one of them a black Mercedes Vito van with tinted windows and diplomatic plates, leaving the consulate and entering the auto park of the residence shortly afterwards. The 15 men reportedly left Turkey that same evening.
Embassies and consulates under the Vienna Convention are technically foreign soil and must be protected by host nations.
Social media sleuths identified another man from the squad as a senior crimes scene investigator in Saudi Arabia.
Both Turkey and Saudi Arabia are allies on the US.
Members of Congress have grown increasingly insistent in recent days that the administration get to the bottom of the disappearance of Jamal Khashoggi, a writer for The Washington Post.