Whether a counterclaim defendant in a state court class action is "any defendant" entitled to remove a class action which satisfies the jurisdictional requirements of the Class Action Fairness Act?

Whether a party which began a case as an original plaintiff, but is solely a defendant at the time of removal, may remove a class action which otherwise satisfies the jurisdictional requirements of the Class Action Fairness Act, or is such removal controlled by a doctrine of "once a plaintiff, always a plaintiff"?

Whether a counterclaim defendant in a state court class action is any defendant' entitled to remove a class action which satisfies the jurisdictional requirements of the Class Action Fairness Act?