Prepared remarks had indicated that Mr Trudeau's wife, Sophie Gregoire Trudeau, was to introduce the Liberal leader.
Canadian Prime Minister Justin Trudeau has had to contend with criticisms for having nationalised a pipeline project to move oil from Alberta to Pacific tidewater for shipping overseas.
RCMP spokeswoman Stephanie Dumoulin said they do not comment on security measures given to the prime minister.
Trudeau is scheduled to be in Mississauga, on Toronto's western edge, where he too is hoping to rally party faithful in the seat-rich Greater Toronto Area.
PG&E restores power to over 2 million California residents as wildfires rage
Thursday, it said that figure could grow to exceed 1 million, which would include about 3 million residents statewide. Transmission lines operated by PG&E have been linked to wildfires that have decimated several California communities.
On the security issue, police stood on the stage surveying the crowd while Trudeau spoke and remained close by his side after his speech as the Liberal leader shook hands with members of the crowd before leaving the room. Several netizens even blamed Scheer for dividing the country and stoking the threat of political violence.
The federal Conservative and NDP leaders put partisan politics aside to show support for Justin Trudeau after a security threat forced the Liberal leader to wear a bulletproof vest and beef up security during an election campaign stop in Mississauga, Ont., on Saturday.
The public broadcaster filed a legal application in Federal Court on Thursday against the Conservative party over its use of CBC clips in an online ad, which included footage from private broadcasters, and was subsequently removed from the party's social media accounts after the CBC complained. "Threats of violence against political leaders have absolutely no place in our democracy", he wrote.
Retors aux sources — Zemmour sur CNews
Malgré aussi l'ultra-violence de son discours à la Convention de la droite sur lequel le parquet de Paris a ouvert une enquête. Diffusé du lundi au jeudi à 19 heures, le programme Face à l'info mettra l'essayiste d'extrême droite au centre du dispositif.
"No matter how you vote or believe, no one should face threats of violence", Singh said. Thank you to the RCMP for taking these threats seriously and keeping us safe. To the officers who protect all of us - thank you.
Trudeau was at the rally mainly to try and swing potential NDP voters to the Liberal Party.
Police wearing backpacks tightly surrounded Mr Trudeau on stage for the first time since the start of a six-week election campaign leading up to what polls suggest will be a closely contested vote on October 21.
Asked about the current government's opposition, Trudeau said only that he had had "many excellent conversations" with Horgan about climate change and improving the economy.
Brexit divorce talks between United Kingdom and European Union go down to the wire
Parliament will meet next Saturday to vote on any deal achieved by the PM at a Brussels summit this week. Downing Street said Johnson told his cabinet to brace for a cliff-hanger finish in the coming days.