Saudi Arabia has denied any involvement in his disappearance.
Khashoggi, who lived in self-imposed exile in the United States, vanished on October 2 after entering Riyadh's consulate in Istanbul to obtain official documents ahead of his marriage to his Turkish fiancee. A senior Turkish official told the Times that they think Khashoggi was killed within two hours of entering the consulate, and that a team of Saudi agents then destroyed his body.
But the 18 others also signed the letter to send Trump a strong bipartisan message of support for a serious U.S. response to Khashoggi's disappearance, Senate aides said. "We have a country that's doing probably better economically than it's ever done before", Trump said. "We want to see what's going on".
Corker's comments highlight a growing tension between Congress, which is calling for action on Khashoggi, and the White House, where President Donald Trump has indicated he's aware of Saudi responsibility but signaled that he's unwilling to take punitive steps, particularly ending arms sales to the kingdom because of the U.S. jobs they generate. "We don't like it and we're going to get to the bottom of it", he added. His Turkish fiancée, Hatice Cengiz, who was waiting outside, said he never re-appeared. He went in, and it doesn't look like he came out.
"We knew of Jamal's interest in building platforms to promote the discussion of issues that he is passionate about, notably freedom and democracy in the Middle East", he said.
Vice President Mike Pence said Wednesday on conservative commentator Hugh Hewitt's show that the United States would send Federal Bureau of Investigation agents to the consulate to investigate if the Saudis requested it.
"It's a very sad situation, this is a bad situation", Trump said. We have a lot of things happening in this country.
Increasing pressure on Trump to respond, a bipartisan group of US senators on Wednesday triggered a USA investigation into Khashoggi's disappearance using a human rights law.
Meanwhile, US President Donald Trump appeared reluctant to consider blocking arms sales to the Kingdom over the disappearance, citing economic reasons.
The Washington Post described President Donald Trump as increasingly frustrated with the lack of response from Saudi officials on questions related to the Khashoggi case.
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All three officials pressed MBS, as the Crown Prince is known, for more details and urged his government to support a transparent investigation, Sanders added.
"I would normally prefer not to address such outrageous claims, especially when it concerns the well-being of a missing citizen who dedicated a great portion of his life to serve his country", Khalid bin Salman said in a statement.
"I think that would be hurting us", Trump said.
In an essay in the Washington Post on Tuesday, Cengiz implored the president and Melania Trump to "help shed light on Jamal's disappearance". Trump visited Saudi Arabia on his first global trip as president and announced $110 billion in proposed arms sales.
Saudi officials offered to allow Turkey to search the premises of the consulate in Istanbul.
The journalist went missing after visiting the Saudi consulate in Istanbul.
According to the Washington Post, U.S. intelligence "intercepted communications of Saudi officials discussing a plan to capture" Khashoggi, a prominent critic of Saudi Arabia's regime.
But State Department deputy spokesman Robert Palladino told reporters they had no such tip.
Mohammed ordered that Khashoggi be lured from the United States, where he had been living for the past year after a crackdown on dissidents in the kingdom, to Saudi Arabia, where he could be detained, the Washington Post reported.
US officials quoted by the Post described the intelligence concerning a Saudi plot to abduct Khashoggi as too vague to trigger a warning to the journalist under longstanding American policy. Bob Corker, the Republican chair of the Senate foreign relations committee, said he believed the Saudis killed Mr Khashoggi; his colleague Lindsey Graham said there would be "hell to pay" if so.