Cross-claim
Overview
 
A crossclaim is a claim asserted between codefendants or coplaintiffs in a case and that relates to the subject of the original claim or counterclaim Black's Law Dictionary
Black's Law Dictionary
Black's Law Dictionary is the most widely used law dictionary in the United States. It was founded by Henry Campbell Black. It is the reference of choice for definitions in legal briefs and court opinions and has been cited as a secondary legal authority in many U.S...

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In the Federal Rules of Civil Procedure
Federal Rules of Civil Procedure
The Federal Rules of Civil Procedure govern civil procedure in United States district courts. The FRCP are promulgated by the United States Supreme Court pursuant to the Rules Enabling Act, and then the United States Congress has 7 months to veto the rules promulgated or they become part of the...

this is codified in Rule 13(g). In the federal rules, a crossclaim is proper if it relates to a matter of the original jurisdiction.
 
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