Ancillary jurisdiction - sustany/dvg GitHub Wiki

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)