Please correct me if I'm wrong...
...but removal from caucus does not equal removal from party, does it?
Personally, I don't think she gave Martin much of a choice. As the PM, he's *got* to persue at least cordial relations with the US. And her statements that the PM could "go to hell," and that she felt no loyalty to "the team" really forced his hand.
Oh well, that's how the minority crumbles.