Photographs have emerged of Mutreb with bin Salman during the Crown Prince's tour of the United States earlier this year.
"[But] Even in Tunisia and Kuwait, where the press is considered at least 'partly free, ' the media focuses on domestic issues but not issues faced by the greater Arab world", he added.
"As a result, Arabs living in these countries are either uninformed or misinformed", he wrote.
A Whitehall spokesman said that they remained "very concerned" over allegations that Mr Khashoggi was tortured and dismembered by Saudis at the country's consulate in Istanbul on October 2.
Turkish officials said the audio recording had been handed over to the U.S. and Saudi Arabia.
Such information would not have been disclosed in Turkey without the consent of the government.
Khashoggi called for the creation of an "independent worldwide forum" to allow ordinary people in the Arab world to address "the structural problems" their societies face.
"The Arab world needs a modern version of the old transnational media so citizens can be informed about global events. More important, we need to provide a platform for Arab voices", Khashoggi writes.
Dozens line up in Kamloops for province's first legal pot store
Although cannabis becomes legal on Wednesday, only one legal dispensary will be opening its doors in British Columbia. Visitors who are of age can use pot while in Canada, but they can't take it with them when they go.
"I do think it's important that everyone keep in their mind that we have lots of important relationships ― financial relationships between USA and Saudi companies, governmental relationships, things we work on together all across the world, the efforts to [counter Iran]", Pompeo said, according to CNN. Now I have to accept: "That is not going to happen".
On Thursday, the Post published what it described as Khashoggi's last column in honor of the missing journalist.
"He just saw how journalism was being smashed around the Arab world and so it was something he was really pushing for", she said.
Security camera images that purport to show the movements of one of the 15 Saudi men believed by Turkish authorities to be connected to the disappearance and apparent death of a Saudi journalist were published Thursday by a Turkish newspaper.
After his visit to Saudi Arabia, US Secretary of State Mike Pompeo said, "My assessment from these meetings is that there is serious commitment to determine all the facts and ensure accountability, including accountability for Saudi Arabia's senior leaders or senior officials". Western diplomats suspect that the kingdom will also compensate Turkey for its willingness to launch a joint investigation on Khashoggi's disappearance - a payback that could come in the form of large-scale debt relief, strategic buyouts or other arrangements that boost Turkey's ailing economy.
As a young reporter, he traveled to Afghanistan to interview Osama bin Laden, who at the time was among CIA-backed militants fighting the Soviet Union.
He said: 'The idea that we can treat Saudi as a normal state if it practises state-sponsored murder outside its borders is simply not true'.
Prince Mohammed has painted himself as the face of a new, vibrant Saudi Arabia, diversifying its economy away from reliance on oil and making some social changes.