The problem is that Snow said this ten years ago, about Bill Clinton. The Chicago Trib's blog has Snow's entire article he wrote about Clinto, here are some excerpts:

Mr. Clinton can't blame his lawyers for this latest feint. He alone can assert the privilege. The maneuver places him at the heart of his administration's ongoing effort to use executive privilege as a way of concealing the truth about whether the president exposed himself

he White House never would assert privilege in the face of a criminal investigation. He merely was reiterating long-standing executive-branch policy along those lines. President Ronald Reagan didn't invoke privilege in Iran-contra, and neither did President George Bush

Taken to its logical extreme, that position would make it impossible for citizens to hold a chief executive accountable for anything. He would have a constitutional right to cover up

Most of us want no part of a president who is cynical enough to use the majesty of his office to evade the one thing he is sworn to uphold the rule of law