The Crown Prince also told associates in August a year ago that if he failed to persuade Khashoggi to return to Saudi Arabia, "we could possibly lure him outside Saudi Arabia and make arrangements" - a communication the Central Intelligence Agency said "seems to foreshadow the Saudi operation launched against Khashoggi".
The closed-door meeting between two leaders, which lasted 50 minutes, was held on the sidelines of the G20 Leader's Summit in the capital Buenos Aires. He said Ankara has shared this evidence with all countries who requested it, including the United States, Britain, Germany and Saudi Arabia. The kingdom has acknowledged that its operatives killed Khashoggi, but it says the operation was not authorised by the crown prince and was undertaken by rogue actors.
The CIA has rated its assessment that Mohammed was involved in the killing at "medium-to-high confidence", and privately, officials have said it is inconceivable that the prince, who exercises total authority over the government, could not have known about such an audacious operation.
Saudi Crown Prince Mohammed bin Salman sent at least 11 messages to the adviser who oversaw the effort to kill Jamal Khashoggi in the hours around the journalist's killing, according to a Wall Street Journal report.
The Trump administration's reluctance to acknowledge reports from the justice community stands in contrast to calls for a U.S. response from lawmakers including Senate Majority Leader Mitch McConnell, who demanded action for Khashoggi's death, which he called "completely abhorrent to everything the United States holds dear and stands for".
"For me, it is obvious that this is an issue that concerns not just Canada but a number of our North Atlantic Treaty Organisation allies", Trudeau said Saturday.
"To me, we've got a relationship with a country that's a semi-important country and a semi-important ally".
Trudeau stressed that he continues to believe "frank and direct" conversations with leaders matter, adding they are what Canadians expect him to do and what the world has come to expect of Canada.
Still, MBS sent at least 11 messages to his closest adviser - who oversaw the team that killed Khashoggi - in the hours before and after the journalist's death, according to a classified Central Intelligence Agency assessment seen by the Wall Street Journal.
However, Moscow has also fostered strong ties with Saudi Arabia's regional arch foe Iran.
Turkey's Erdogan has said Jamal Khashoggi's murder was ordered by the highest level of Saudi leadership.
Earlier this month, the United States imposed its own sanctions on Saudi officials for the same reason.
Speaking to reporters at the G20 summit in Buenos Aires, Erdogan said that solving the Khashoggi killing would also be in the interest of the Saudi monarchy. Russian Federation and Iran back President Bashar al-Assad in Syria's civil war, while Saudi Arabia along with Western countries have backed some rebel groups.