Rider University has been hit with a suit over its plans to undo its 1992 merger with Westminster Choir College of Princeton and to sell the music school and its campus.

The suit, filed Tuesday in the U.S. District Court for the Southern District of New York, seeks a declaration that Rider’s plans to divest itself of Westminster violate the terms of the merger agreement. The 10 plaintiffs include students, parents, alumni and the two surviving Westminster trustees from the pre-merger period.