President Recep Tayyip Erdogan did not confirm the alleged killing saying he would await the result of an investigation. "It is (the duty) of the consulate officials", Mr Erdogan said during a visit to Hungary. "We don't have any information on that", spokeswoman Heather Nauert told reporters adding: "We don't want to make any judgments about what happened".
Five days after a prominent Saudi journalist went missing at the Saudi Arabian consulate in Istanbul, there are still more questions than answers.
United Nations spokesman Stephane Dujarric says the United Nations chief is following the Khashoggi case "closely", noting that an investigation is taking place in Istanbul.
Multiple media reports say that the group of 15 Saudis descended on the consulate Tuesday and later left.
Khashoggi fled from Saudi Arabia in September 2017, months after Prince Mohammed was appointed heir to the throne.
"He entered the general consulate himself and if he has entered by himself and if he did not exit it, of course this should be proven by the general consulate", Erdogan said at a press conference in Budapest.
"If Khashoggi was indeed murdered inside a diplomatic facility, it is an act of terror that echoes Russian and Chinese tactics of extraterritorial, extrajudicial attacks on dissidents, meant to intimidate any who would speak out against the Saudi government, no matter where they may be, and giving the lie to official narratives of "reform" in Saudi Arabia", said Summer Lopez, PEN America's senior director of free expression programs.
On Monday, a Turkish official also said Saudi Arabia's envoy to Ankara had been summoned to the foreign ministry for a second time on Sunday and had been asked by Turkish diplomats to be "in full coordination" on the matter.
The reporter, who was a former government advisor, was self-exiled in the U.S. in 2017 as he was afraid of a possible arrest, following his criticism on the decisions of Saudi Prince, Mohamed Ben Salman, and Riyadh's military intervention in Yemen. "I also urge Saudi Arabia, especially King Salman and Crown Prince Mohammed bin Salman, to show the same level of sensitivity and release CCTV footage from the consulate".
While angry members of Congress likely won't cause the administration to end decades of close security ties with Saudi Arabia, the initiation on Wednesday of possible sanctions under the Global Magnitsky Human Rights Accountability Act indicated the depth of concern on Capitol Hill over Khashoggi's case.
"I have raised Jamal's disappearance personally with the Saudi ambassador, and while we await more information, know we will respond accordingly to any state that targets journalists overseas", he wrote. Saudi Arabia and other members of the anti-terror quartet (UAE, Bahrain and Egypt) have cut off relations and imposed a boycott of Qatar since a year ago, accusing the Gulf nation of supporting terror and meddling in internal affairs. She told the newspaper, "I can not think such an incident is acceptable to happen in Turkey".
CNN reported Sunday that the U.S. government is quietly working Khashoggi's case across several agencies and at senior levels of the administration. While the Guardian did run a column about Khashoggi on its front page, some Twitter users noted that it seemed like the newspaper was trying to downplay the story by not making it the main focus.