Rule 4:64-5. Joinder of Claims in Foreclosure

Unless the court otherwise orders on notice and for good cause shown, claims for foreclosure of mortgages shall not be joined with non-germane claims against the mortgagor or other persons liable on the debt. Only germane counterclaims and cross-claims may be pleaded in foreclosure actions without leave of court. Non-germane claims shall include, but not be limited to, claims on the instrument of obligation evidencing the mortgage debt, assumption agreements and guarantees. A defendant who chooses to contest the validity, priority or amount of any alleged prior encumbrance shall do so by filing a cross-claim against that encumbrancer, if a co-defendant, and the issues raised by the cross-claim shall be determined upon application for surplus money pursuant to R. 4:64-3, unless the court otherwise directs.