A plaintiff filed a negligence action against two defendants in federal district court, invoking the court's diversity of citizenship jurisdiction. Prior to serving their answers, the defendants filed a motion to dismiss for lack of subject matter jurisdiction. The court denied the motion, concluding that subject matter jurisdiction was proper. The defendants then filed their answers responding to the merits of the complaint and denying negligence. The defendants' answers also contained motions to dismiss the action for lack of personal jurisdiction. Five weeks later, the defendants filed a motion to dismiss the action for improper venue. If the court determines that venue in fact is improper, how should the court rule on the defendants' venue motion