There was the Darlington nuclear plant upgrades recently, which were completed ahead of schedule. Borealis was announced last year indicating new military research development. France had a nuclear sub in one of our ports, they already have nukes. I’m pretty sure they are going for them in secret and may already have one.
It would put Trump in place though. He’s bitching about Canada always taking advantage of the US military. If Canada says “fine, we bought new tanks, built up our army, and oh yeah, we’re making nukes so we don’t need to borrow yours” there isn’t much he could say politically.
Of course Trump is huge fucking idiot and flips his script depending on how much shit is in his diaper. He has zero consistency so there is no reason to try and appease him. He could decide to attack Canada because of nukes or because we didn’t name a bridge after him.