You might be thinking of NATO nuclear sharing, where certain NATO members that aren’t nuclear powers themselves get access to nuclear bombs in the U.S. arsenal.

You might be thinking of NATO nuclear sharing, where certain NATO members that aren’t nuclear powers themselves get access to nuclear bombs in the U.S. arsenal. In order to actually use those weapons you need a fighter/aircraft platform certified to use those nuclear bombs. And there are only a couple fighters certified for the nuclear mission, the f-35 among them. But only a handful of NATO members are a part of nuclear sharing, and Canada isn’t one of them IIRC.