You are a paralegal employed by a civil litigation attorney practicing in Illinois. Your employer wants to remove a recently filed case from state court to federal court. Your employer asks you to check the statutes and procedural rules and let him know whether the case can be removed. The case is a civil rights case involving 42 U.S.C. § 1983 and other claims. From reviewing the removal statute, you learn that a defendant may remove a state-court case to federal court if federal subject matter jurisdiction exists. You remember from your paralegal training that the two main forms of federal subject matter jurisdiction are diversity jurisdiction and federal question jurisdiction. In this case, both the plaintiff and the defendant are citizens of the state of Illinois. What other information do you need to determine whether the case can be removed?