The ban comes at a time when relations between the two countries are already strained. The Canadian government recently accused Chinese hackers of infiltrating the computer systems of Canada's top research and development organization, which China denies.
Just a few days later, authorities in China arrested a Canadian couple on suspicion of stealing state secrets about military and national defense research. They remain in custody.
Jason MacDonald, chief Harper spokesman, said in an email yesterday from the Arctic that "some media outlets are not welcome on the trip."
In a telephone interview, Li acknowledged pushing Vaux last year, but said the prime minister's office discriminated against Chinese journalists by not allowing him to ask a question and later having him manhandled by police.
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Li, the bureau chief for the Communist Party newspaper and a former Washington correspondent, said he couldn't understand why he was silenced. Harper's staff limits the number of questions at public events.
Li said he didn't even apply to go on this year's trip. "Why do they discriminate against Chinese journalists? For racial reasons?" he said. "They didn't give me any reason." Xinhua News Agency reporter Baodong Li said he applied but was told he could not go because of a lack of space. He doesn't understand why he was banned.
David Mulroney, Canada's ambassador to China from 2009 to 2012, said journalists in China can be quite aggressive, and have been for some time.