Khashoggi, a Post columnist, had gone to the consulate to obtain documents necessary to marry his Turkish fiancee.
In the audio, it is also possible to hear bin Salman saying "Don't worry" to Macron, to which French president responds, "I am anxious".
How are leaders greeting the Saudi Crown Prince?
In an image that quickly went viral online, Russian President Putin and the 33-year-old prince grinned broadly and gave each other an effusive handshake as if they were long-lost friends reunited at the G-20.
French President Emmanuel Macron is welcomed by Argentina's President Mauricio Macri as he arrives for the G20 leaders summit in Buenos Aires, Argentina November 30, 2018.
Later in the one-minute clip posted on Twitter, Macron is heard saying, "You never listen to me", to which bin Salman replies, "I will listen, of course", as they were standing close together and apparently unaware their conversation was being recorded.
Trump gives Melania the honor to light National Christmas Tree in DC
On the latest installment of her show, Wendy told her audience that she is weirded out by the first family's Christmas trees . Also participating is Dianna Hart, whose daughter, Demi Lovato, has been vocal about her struggle with addiction.
James Mattis: No Smoking Gun Implicating Saudi Crown Prince
Germany has halted arms sales to Saudi Arabia in response to the killing and urged others to do the same. The fallout from the Senate vote adds even more pressure on Riyadh to assuage the White House.
Sidhu will win if he contests election in Pakistan: Imran Khan
For that, Khan needed to isolate bilateral ties from Pakistan's terror policy, and India came forward with the ideal opportunity. Sidhu described the Kartarpur Corridor as a major opportunity to open the hearts of the people in the two neighbouring countries.
Mrs May is said to have told the Crown Prince to take action to prevent future incidents like the murder of Mr Khashoggi from happening.
Another French official said Macron confronted bin Salman as soon as he saw him enter, calculating that it was better to address his concerns than to ignore them or shun the prince.
An official from Macron's office said the meeting with bin Salman was necessary, as European nations wished to send a united message about the need for honesty in the investigation and were not going to sidestep an opportunity to reinforce that message during the G20 summit. But the crown prince's reputation has taken a turn after the murder of Khashoggi in Turkey.
The US Senate nonetheless moved this week to end support for the Saudi-led war against rebels in Yemen amid outrage over attacks on civilian sites including a school bus and hospitals.
Yesterday Mr Trump cancelled a planned sit down with Mr Putin, citing Russia's recent seizure of Ukrainian ships and sailors.
"They exchanged pleasantries at the leaders' session as he did with almost every leader in attendance", the White House official said on Friday.
The demonstrators also accused the G20 group of countries of concentrating too much on financial interests and globalization, while condemning austerity measures proposed by Argentina's government and backed by the International Monetary Fund, a dignitary at the summit.