What is the primary requirement for a claim to fall under supplemental jurisdiction?

A claim must be related to the original jurisdiction claim to fall under supplemental jurisdiction, which is fundamental to how courts can efficiently resolve interconnected claims in a single proceeding. Supplemental jurisdiction allows federal courts to hear additional claims that arise from the same nucleus of operative fact as the original claim, even if those additional claims would not independently qualify for federal jurisdiction.

This provision ensures that all related issues are addressed together, preventing the need for multiple lawsuits. Relatedness typically means that the additional claim shares a significant factual connection with the original claim, meaning that litigating them together would promote judicial efficiency and coherence in legal determinations.

While certain claims may involve state law and might involve different parties, these factors alone do not fulfill the requirement for supplemental jurisdiction. The connection to the original jurisdiction claim is key, and the other aspects become secondary in determining if supplemental jurisdiction can be invoked.