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Tom Flanagan, the political scientist and former Stephen Harper collaborator, was in the red chair to talk about his new book, Persona Non Grata.
Flanagan, whose career was affected by a political attack, used the example of an attack on honest-speaking Justin Trudeau to explain how such things can have a negative impact.
"I have to say, I'm obviously conservative, I'm not a big booster of (Liberal leader) Justin Trudeau," said Flanagan. "But I felt kinda bad for Justin when he made his weak joke about Russia and the Ukraine and then the Conservatives jumped on it. All parties do this to their opponents. And it really is the death of understanding to treat debate that way.
"But it's the way the political game is played."