VANCOUVER, British Columbia — Every day when he arrives at his office in City Hall, Mayor Ken Sim stares at a prominent black-and-white photograph of Chinese railway workers toiling on the tracks in British Columbia in 1884. Mr. Sim, the son of Hong Kong immigrants, said the workers’ weathered faces are a daily reminder of the symbolic importance of his election as Vancouver’s first Chinese Canadian mayor, and of just how far Chinese Canadians have come. Six months ago, his historic landslide victory was widely lauded, viewed as the triumph of a politically adroit change-maker whose centrist policies had swept him to power. But since February, the Globe and Mail newspaper in Toronto has cited classified intelligence reports in describing an effort by Beijing to manipulate Canadian elections, including those in Vancouver, raising questions about whether China played a role in his win. Across Canada, a political storm is raging over the intelligence reports, which have not been made public by Canada’s national intelligence agency but are said to conclude that the government of China and its diplomats wanted to ensure victory for Prime Minister Justin Trudeau’s Liberal Party in the two most recent federal elections, while encouraging wins for some candidates of Chinese descent.

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