From RedState:

Armstrong asked R Street Institute Senior Fellow Paul Rosenzweig if he agreed with that.

Rosenzweig replied, “I agree, though I would say that nothing in the statute prevents [the attorney general] from asking a court for permission to provide that rule 6(e) material.”

Armstrong said, “I agree with that, but nothing in the statute or authority compells him to do that and a subpoena doesn’t compell him to go to court.”

Rosenzweig agreed. “A subpoena surely does not compel him to go to court.”