Rather, the reservation of the right to assert an affirmative defense is a "legal nullity." See, e.g., Fed. Deposit Ins. Corp. v. Giannoulias, No. 12-c-1665, 2014 WL 3376892, at *9 (N.D.Ill. July 10, 2014) ("The defendants' 'reservations of rights' are stricken as a legal nullity."); Wellsv. Farmers All. Mut. Ins. Co., No. 2:07CV00036 ERW, 2009 WL 1259977, at *7 (E.D.Mo. May 4, 2009) (striking defendant's answer to the extent it reserved the right to assert an affirmative defense); Messick v. Patrol Helicopters, Inc., No. 07-CV-039, 2007 WL 2484957, at *4 (D.Mont. Aug. 29, 2007) ("The Federal Rules of Civil Procedure do not provide a mechanism for a party to 'reserve the right' to assert a defense.").