Before we get to that point, it's a better idea for government and business leaders to communicate with their American partners to have them put pressure on Trump and his advisors to avoid those tariffs in the first place.
And the Canadian government is already doing that. They've been planning contingencies since (at least) the US primaries.
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Of course, they're not going to send out a press release detailing those plans - it would be stupid to alert the very people you'll be negotiating with to the details of all your plans.