https://paulmollicafederalcourtsblog.com/2026/08/26/ninth-circuit-holds-that-a-federal-court-may-exercise-supplemental-jurisdiction-over-a-state-law-claim-even-where-the-federal-claim-is-a-permissive-counterclaim-under-fed-r-civ-p-13b/Paul Mollica's Federal Courts Blogen2026-08-27T00:18:21+00:00Ninth Circuit Holds That A Federal Court May Exercise Supplemental Jurisdiction Over a State Law Claim Even Where the Federal Claim is a Permissive Counterclaim Under Fed. R. Civ. P. 13(b)Appellate Jurisdiction, Ninth Circuit, Supplemental Jurisdiction, Fed. R. Civ. P. 13, 28 U.S.C. § 1367(a), 28 U.S.C. § 1295(a)(1), Permissive Counterclaim, Compulsory Counterclaim, Common Nucleus of Operative Fact, Transaction or Occurence