The Toronto International Film Festival kicked off on a political note Thursday, as Canadian Prime Minister Mark Carney and the Obamas delivered opening remarks before Hollywood A-listers arrive to take center stage.

North America's biggest film festival is celebrating its 50th edition. Stars including Daniel Craig, Sydney Sweeney and Matthew McConaughey are set to unveil their latest movies over the next 11 days.

But the arrival of actors and filmmakers from the United States comes against the backdrop of US President Donald Trump's threats to take over his northern neighbor.

Taking the stage before TIFF's opening film, a documentary about homegrown comic John Candy, Carney warned that "our sovereignty, our identity has come under threat."

"And when Canadians heard those threats, they

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