Meanwhile Secretary of State Mike Pompeo has told CNN that he saw all the intelligence held by the USA on the killing and said there was no direct evidence linking Prince Mohammed to the murder.
The incident has caused countries to re-examine their relationship with Saudi Arabia, and USA lawmakers are reconsidering whether Washington should support the Saudi war against Yemen.
After press reports that the Central Intelligence Agency was pointing the finger directly at Prince Mohammed bin Salman, Trump issued a statement saying that US-Saudi relations and oil market stability were too important to rock over the scandal.
World leaders have been virtually unanimous in their condemnation of Saudi Arabia for its role in the murder of Jamal Khashoggi at its consulate in Istanbul.
The prime minister says he also spoke directly with Saudi Arabia's crown prince on the margins of a dinner last night in which he discussed the diplomatic discord that has been happening between Canada and the kingdom. Riyadh is now seeking the death penalty for five members of the hit squad in a move that appeared to be aimed at appeasing global outrage over the killing and distancing the killers and their operation from the crown prince.More news: Kid Rock slams Joy Behar in Fox interview
More news: Ukraine bans Russian men from entry in martial law Crackdown
More news: Cameroon stripped of rights to host 2019 African Nations Cup
Both leaders are in Buenos Aires to attend the G20 summit on Friday and Saturday.
The crown prince was filmed in an apparently tense conversation with Mr Macron, telling the French president not to worry.
Putin and Prince Mohammed are due to hold bilateral talks on Saturday, according to Kremlin documents seen by Reuters. Saudi officials have denied that MBS was involved while giving conflicting accounts of what happened to Khashoggi.
But there was no immediate comment from Russia's president Vladimir Putin, who in the past has called the breakup of the Soviet Union under Bush's president a "historical tragedy".
The Associated Press reported that Trump, who's been publicly skeptical about the CIA's findings, walked by the chummy pair without appearing to acknowledge them.
"We have evidence that Saudi journalist Khashoggi was killed in 7.5 minutes, we shared that evidence with all countries who demanded", he said.