to change that result. George has failed to demonstrate an objective external factor that prohibited him from raising an objection to the jury selection plan prior to his trial; accordingly, he has not shown cause to excuse his waiver of this issue. See United States v. Simpson, Nos. 97-2305, 97-2307, 97-2316, 98-1050, 1999 WL 777348, at *10 (6th Cir. Sept.21, 1999) (stating that “the fact that Ovalle was not decided until after [defendant’s] trial is not sufficient cause for this court to grant relief from the waiver of the issue”); see also United States v. Bischoff, Nos. 97-1980, 97-1983, 1999 WL 644340, at *6 (6th Cir. Aug.19, 1999) (cause not shown for failure to raise Ovalle in district court); United States v. Valme, No. 98-1340, 1999 WL 519232, at *5 (6th Cir. July 16, 1999) (<HOLDING>); United States v. Garavaglia, Nos. 98-1512,
holding that cause did not exist fordefen dants failure to timely raise ovalle issue holding that there was no good cause to raise an untimely suppression issue where the defendant could have with due diligence discovered the information necessary to timely raise the issue holding that failure to raise an issue in an opening brief waives that issue holding that failure to raise issue in brief constitutes waiver of appeal of the issue holding that the failure to raise an issue in the opening brief waives the issue