Sounds like Trudeau is trying to set up the Conservatives to be the straw men should the talks fail.  As far as keeping Canadian politics in Canada, I remember very well these was a conference on climate change in South Africa a few years back.  The Harper government paid the way for Opposition members to attend,  Press reports said  the Opposition members spent most of their time in the convention halls disparaging the official position of the Canadian government.  So much for keeping our politics at home!