In a move that comes amid a vicious split among federal trial courts, an Illinois plaintiff is asking a U.S. appeals court to decide whether a ruling that limits personal jurisdiction in mass torts should also apply to class actions.

The Washington Legal Foundation and the U.S. Chamber Litigation Center have filed amicus briefs in the U.S. Seventh Circuit Court of Appeals, supporting IQVIA Holdings Inc., a health care information company. IQVIA, a Pennsylvania-based company, argued successfully in the trial court that it should not be forced to defend itself in an Illinois court against nationwide class plaintiffs who also have no relationship to Illinois. The case’s outcome will be significant for general counsel and their companies.