I think we've been in the mindset of considering terrorist events, and we've had plans that have considered the use by terrorists of certain kinds of weapons, be they nuclear, chemical, or biological, and those kinds of things. Public notification and public response through provinces, the federal government, and municipalities are all a part of that. Shifting to a mindset of a possible nuclear attack by some nation on the Canadian land mass, there is a logical extension of the things we already do, so there's an evolution of existing planning, not the requirement for a new plan.
On September 14th, 2017. See this statement in context.