Khashoggi was last seen entering the Saudi Arabian consulate in Istanbul to obtain documents for his upcoming wedding, his fiancée told the Post.
Turkish officials disputed the account of Saudi consulate officials regarding his disappearance.
"As we speak today, there [are] Saudi intellectuals and journalists jailed".
On Thursday, Turkey's foreign ministry summoned Saudi Arabia's ambassador to Ankara "for consultations" over the critic's disappearance. As per the rules in some embassies and consulates, he was also required to surrender his mobile phone.
But Saudi Arabia claimed he had entered and then left the mission on Tuesday.
'I believe, and I'm sorry if anyone misunderstands that, but President Obama, in his eight years, worked against many of our agenda - not in Saudi Arabia, but also in the Middle East, ' said MBS, as he is called.
USA unemployment drops to the lowest level since 1969
Economists are questioning whether an economy at a 3.7 unemployment rate will be able to add that many jobs in the next 12 months. Hospitals added 12,000 jobs last month, 47% of total healthcare hiring, and easily beating out ambulatory's 10,300 jobs.
Saudi Arabia's Crown Prince Mohammed bin Salman praised his relationship with Donald Trump after the USA president told supporters he had warned the king he would not last in power "for two weeks" without United States military backing. "If this is the case, [the consulate] should let their "guest" go", Turan Kışlakçı, a Turkish journalist and friend of Khashoggi told reporters after reading a statement on behalf of the nonprofit Turkish-Arab Media Association, which is monitoring the case. Newspaper staff have contacted Saudi and Turkish officials in search of his whereabouts.
Mr Khashoggi - a critic of Saudi Crown Prince Mohammed bin Salman - has not been seen since visiting the Saudi consulate in Istanbul on Tuesday.
The Saudi envoy was called in on Wednesday, they said, to clarify the whereabouts of Khashoggi, a critic of Riyadh's foreign policy and its crackdown on dissent who left Saudi Arabia previous year saying he feared retribution for his views. He is not the first or only high-profile dissenter to have been jailed, and even stated in his writing that he would likely have been arrested if he had stayed in Saudi Arabia. Saudi officials say otherwise. Protesters have been demanding reforms, freedom of expression, release of political prisoners, and an end to economic and religious discrimination against the oil-rich region.
Explaining that, after Trump became U.S. president, Saudi Arabia has already agreed to procure almost 60 percent of its arms from Washington, he emphasized that Riyadh owes nothing extra because it always pays for weapons supplies in cash.
The protests have been met with a heavy-handed crackdown by the regime, with Saudi forces beefing up security measures across the province. Nimr had been arrested in Qatif in 2012.