The well-pleaded complaint rule is a legal principle that requires a plaintiff's complaint to establish the jurisdiction of a federal court by clearly and affirmatively presenting a federal question in the complaint itself. This rule ensures that a case can only be brought in federal court if the plaintiff's claim arises under federal law, meaning that the issue must be evident from the face of the complaint without considering any potential defenses. It serves as a gatekeeping mechanism to determine whether a federal question jurisdiction exists based solely on the plaintiff's allegations.
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