My deductive logical reasoning makes me believe strongly that Fitzgerald made all sorts of assertions about national security interests trumping Miller's right to keep her mouth shut over her sources.
Fitzgerald even started his speech on the day of the indictment by referring to national security interests. Then, with the only charges about Libby having nothing to do with national security, he revealed that he was trying to pull another fast one.
He went to the well one time too often, and that will be shown IF the sealed papers become unsealed. If not, I'm not so sure I ought to give a hoot.