It is not the role of the Chair to rule on the passion, devotion or enthusiasm a member may display on an issue that affects his riding a great deal. Unfortunately, that has nothing to do with the situation.
Clearly, in the context of what occurred during oral question period, the word liar is unparliamentary.
I ask the member for Saint-Hyacinthe—Bagot to reconsider and to withdraw the word liar.