Waiver-of-subject-matter-jurisdiction

QUESTIONS PRESENTED 1. Canarguments in support of a court’s subject-matter jurisdiction be waived? 2. The Federal Magistrates Act provides that a “judge of the [district] court shall make a de novo determination of those portions of the [magistrate judge’s] report or specified proposed findings or recommendations to which objection is made.” 28 U.S.C. § 636(b)(1). Does § 636(b)(1) permit a district court to find that a party has waived de novo review of an objection toamagistrate judge’s report and recommendations because the issue or argument was not first raised before the magistrate?