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There is an unwritten but well understood rule in Canadian politics, in fact it stands for most Western countries — you don’t attack your political opponent on foreign soil.

The idea goes that as much as politicians may disagree here at home, there is a united front on the international stage.

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Consider it the grown up and political equivalent of the rule from when you were a kid, you and your siblings could fight and call each other names but you didn’t let people outside the family do that.

So it is, or is supposed to be, with politics.

But do those rules still apply if the international stage is on Canadian soil?

Justin Trudeau used an international summit, paid for by the taxpayers of Canada, to attack his political foes this week.

The Nature Champions Summit was held in Montreal over the past few days, here is how the government website described it.

“Nature champions from around the world, including governments, major philanthropists, business leaders, non-governmental organizations, youth, Indigenous leaders, and United Nations agencies will be coming together to build a new high-ambition coalition to drive global nature protection forward.”