Mulroney was the leader of the  PC Party of Canada which actually used to be my party and bears little resemblance to the alt right wing  Conservative Party of today which is Reform/Rebel run. The party of today is unfit to govern and even unfit to be Her Majestys Loyal Opposition as they have demonstrated recently as they fly right off into alt right space.
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 This party under Scheer has outed itself in this whole affair with their running to the US to air their disagreements with the government of Canada, spread  misinformation and  inflame the Trump base against  Canada. Tony Clement for example is already crowing that the Trudeau governments full court press on NAFTA "lies in ruins". Or so he hopes.

It is an ugly picture. Today Brian Lilley of the Sun/Rebel tweeted Sean Hannity to beg him to get involved as the CPC/Rebel Khadr  campaign on Fox had evidently not reached sufficient levels of crazy.