Trump has since voiced sadness over the killing of Khashoggi, who lived in the United States and wrote for The WashingtonPost.
During the five-minute exchange, Salman is heard urging Macron not to worry, to which the French president promptly replied, "I am anxious".
Both leaders are under fire on the global stage, with Salman accused of ordering the killing of journalist Jamal Khashoggi at an embassy in Turkey.
How are leaders greeting the Saudi Crown Prince?
Mr Putin's spokesman Dmitry Peskov reportedly greeted news of the cancellation by saying that while it was regrettable, it left the Russian president with a couple of extra hours to meet other leaders on the sidelines of the summit.
The French presidency said that Macron spoke to the prince about the killing of journalist Jamal Khashoggi and the Saudi Arabian-led offensive in Yemen, where millions are on the brink of starvation.
(From L to R) China's President Xi Jinping, Singapore's Prime Minister Lee Hsien Loong, Russia's President Vladimir Putin, Rwanda's President Paul Kagame, Brazil's President Michel Temer and Saudi Arabia's Crown Prince Mohammed bin Salman line up for a family photo during the G20 Leaders' Summit in Buenos Aires, Argentina, on November 30, 2018.
A spokesman for the Prime Minister's office confirmed Theresa May and MBS had spoken on the sidelines of the G20 summit this evening. But it received wide traction on social media, with Macron telling the prince, "You never listen to me", to which Prince Mohammed replies, "I will listen, of course".
Enlarge this image
The Saudi Gazette newspaper posted a video of the meeting online showing the two speaking in hushed tones with their heads close together.
At the end Macron can be heard saying: "I am a man of my word".
Proposed US congressional legislation on Yemen, even if passed, is unlikely to impact on Saudi Arabia's ability to pursue the war in Yemen due to available Egyptian, Emerati, and Israeli support.
After repeated denials of any knowledge about Khashoggi's disappearance, Saudi Arabia finally admitted the 59-year-old had been murdered at the mission in a "rogue" operation.
"They exchanged pleasantries at the leaders' session as he did with almost every leader in attendance", a senior White House official said.
The US president cancelled a formal sit-down with Mr Putin at the summit in Argentina over Moscow's seizure of Ukrainian vessels.
The two will likely find common ground in that the Russian leader has also been put under increasing pressure from Western countries in recent days.
He told The Wall Street Journal it was " highly unlikely " he would refrain from lifting the levy rates to 25 percent. This week General Motors announced it would close five of its North American plants, costing of almost 15,000 jobs.
The migrants' presence has drawn demonstrators - for and against them - and threats from Trump to close the US-Mexico border. The circumstances at the San Ysidro border crossing Sunday were exceptional, but the question facing the agents was not.
It is believed the probe involves the so-called Panama Papers , leaked documents pertaining to over 200,000 offshore dealings. It is separate from another money laundering scandal surrounding Danske Bank , where Deutsche Bank is involved.
Jonas Jerebko added a season-high 20 points, but it wound up not being enough as the Dubs lost their fifth straight road game. Durant capped an 18-point third quarter with a 32-foot pull-up three, the final basket in a personal 13-point streak.
She was also asked about her children and said the little Cambridges are getting into the festive spirit. When a fan asked the duchess if she was excited about Meghan's baby news, she responded with grace.
A United Nations panel recently adopted a resolution calling for accountability for gross human rights violations in North Korea. The US has been adamant pressure and sanctions must be maintained on Pyongyang until it fully dismantles its weapons programme.
We've let our position be known and we're not happy about it", "This country has done a lot for General Motors . The charges will take place in the fourth quarter of 2018 and the first quarter of next year.
The FBI claims that lobbyist and political consultant Paul Manafort lied to the government " on a variety of subject matters ". Manafort had been meeting with the special counsel's office since he pleaded guilty in September and agreed to cooperate.
U.S. authorities, however, believe that there was "no conceivable justification. for the use of force in this scenario". Trump told The Washington Post he was waiting for a "full report" from his national-security team about the incident.
Kragthorpe, who was a once the offensive coordinator for the Tigers, has a pacemaker and has Parkinson's disease. I have no idea who the guy is. "I didn't appreciate getting punched in my pacemaker", Kragthorpe said.
How Cohen's Plea Compares To What Don Jr
He also criticized Cohen , saying he was "a weak person and what he's trying to do is get a reduced sentence". As he left the White House shortly after the court proceeding concluded, Trump called Cohen "a weak person".
Storm Diana weather warning for Cumbria extended
Gusts of up to 60mph (97 km/h) were recorded along Irish Sea coast on Tuesday, with stronger winds expected on Wednesday. Winds will also turn northwesterly across Northern Ireland later, transferring the main focus to northern areas here.
Apple grilled on App Store pricing
However, the plaintiffs are backed by the attorneys general of 30 states including California, Texas, Florida and NY . A judge could triple the compensation to consumers under antitrust law if Apple ultimately loses the suit.
Kyrie Irving Says The Celtics Are ‘Almost At’ Rock Bottom
He said the film would only show mistakes the players were already aware of. "We started off the game and we never looked back". In a league of super-teams, it's not a great sign when a player feels he has to do it all to keep his team competitive.
Camp fire fully contained
Officials said most of the victims of the fire identified so far have been of retirement age. More than 1,000 firefighters were involved in the efforts to contain the blaze.
Taiwan's president resigns from party leadership
According to the court ruling, if the Parliament fails to do so by 24 May 2019, same-sex marriage will automatically become legal. China claims sovereignty over self-ruled Taiwan , causing decades of friction between the two sides.
Meghan causing 'rift' between Harry, Will
It's been an unforgettable year for the Duchess of Sussex , who joined the royal fold after her wedding to Prince Harry in May. Interested in Royal Family? Maybe the city life isn't for Harry and Meghan.