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 doesn’t matter how many nukes the US has. If we have the capability to turn NYC into the surface of the moon, the US wouldn’t risk it.