ancillary jurisdiction

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Ancillary jurisdiction allows a federal court to hear a claim that would normally be outside of its subject-matter jurisdiction if it is substantially related to a second claim that is within the court's jurisdiction.  A claim comes within a federal court’s ancillary jurisdiction when it bears a logical relationship to the aggregate core of operative facts of the main claim, and the main claim meets the requirements of federal question jurisdiction, or diversity jurisdiction.

See: e.g., Hendrickson v. U.S 791 F.3d 354 (2015)

[Last updated in June of 2022 by the Wex Definitions Team]