Does 28 U.S.C. § 636(b)(1)(C) allow a district judge, on de novo review of objections to a magistrate's report, to refuse to consider a motion to certify an issue of state law that was presented to the magistrate, on the ground that such a motion is itself a "new argument" that was not first presented to the magistrate who, in most, if not all, cases, has no authority under state certification statutes to grant it?

Does 28 U.S.C. § 636(b)(1)(C) allow a district judge to refuse to consider a motion to certify an issue of state law that was presented to the magistrate