t to 28 U.S.C. § 2201 (2000), this court's underlying 1 juris- diction lies in diversity of citizenshi , pur- suant to 28 U.S.C. & 1332 (2 , See Volvo Const. Equip NAm., Inc. CLM Equip. Co., 386 F.3d 581, 5 (4th Cir.2004) (holding "a federal court may properly exercise jurisdiction in a declarat- ory