Not defending Lamberth's decision, but his role is to review decisions by lower courts.
here is 36 pages search warrant affidavit:
http://www.scribd.com/doc/142586637/FBI-s-Affidavit-For-Search-Warrant-Of-Fox-s-James-Rosen
Not defending Lamberth's decision, but his role is to review decisions by lower courts.
Moreover, the original magistrate judge had issued the warrant. The dispute here involved the question of disclosure: i.e., whether DOJ was going to have to notify Rosen (at some future time, at a minimum) that his electronic files were being searched, or whether DOJ could keep that information secret for as long as DOJ liked (including, forever).