Whether Rule 12's good-cause standard displaces the plain-error standard in Federal Rule of Criminal Procedure 52(b)

Question Presented ; Federal Rule of Criminal Procedure 12(c)(3) provides that certain pretrial : motions are “untimely” if not raised by the deadline set by the district court, but “a court may consider the defense, objection, or request if the party shows good cause.” When a defendant raises a new theory on appeal in support of a suppression motion filed in district court, is the argument reviewable for plain error, as the : Fourth, Fifth, Sixth, and Eleventh Circuits have held, 4 or does Rule 12’s good-cause standard displace the : plain-error standard in Federal Rule of Criminal Procedure 52(b), as the First, Second, Third, Seventh, q Eighth, Ninth, and Tenth Circuits have held? i | Statement of