38 | © 2022 Themis Bar Review, LLC | MBE Civil Procedure
o Requires an ______________________________ jurisdictional basis: Must be a federal
claim OR there must be complete diversity of citizenship with $75,000+ in issue.
o Statute of Limitations: A permissive counterclaim must be timely as of the date it is filed or
it’s time-barred.
Example 43: Ann, Ben, and Carol are involved in a three-car accident together.
Ann sues Ben and Carol, alleging they are both at fault and seeking $100,000
from each of them. Rule 20 allows Ann to join her claims against Ben and Carol
into one action because the claims arise from the same accident and will involve
similar questions of law and fact. As long as the parties are diverse, there will
be subject-matter jurisdiction in federal court.
Suppose Ben thinks the accident is Ann’s fault and wants to recover $50,000 in
damages from her for his injuries. Ben should file a compulsory counterclaim
against her. The court can exercise ______________________________
jurisdiction over this claim because it arises out of the same common nucleus of
operative fact (transaction or occurrence) as Ann's claims. It is also a claim by a
defendant (not a plaintiff), so it is not barred by any of the exceptions to
supplemental jurisdiction for diversity cases.
If Ann owes Ben money from an unrelated gambling debt, that would be a
______________________________ counterclaim because it did not arise from
the same event as Ann’s claim. Therefore, supplemental jurisdiction would not
apply, and Ben could only bring the claim if it had an independent jurisdictional
basis (e.g., if the claim between these diverse parties met the AIC requirement).
C. Cross-claims
Claims asserted against a ______________________________.
o Plaintiff v. co-plaintiff, defendant v. co-defendant
Must arise out of the same transaction or occurrence as the original claim or a
______________________________
Exam Tip 19: Cross-claims will often fall under supplemental jurisdiction, but
not always. Remember to analyze whether the cross claim satisfies federal SMJ
on their own or through supplemental jurisdiction.
Example 44: Continuing from the previous example, if Ben also assert a cross-
claim against his co-defendant, Carol, for $50,000, alleging that she is also
liable for the accident, is there supplemental jurisdiction?
______________________________
Example 45: Now suppose that Ann's passenger Damon is another plaintiff in
this case. Damon now wants to assert a cross-claim against his co-plaintiff Ann
because he thinks that she is also at fault in causing the accident. Is there
supplemental jurisdiction? ______________________________.