Specter told Gonzales that even the Supreme Court had ruled that "the
> president does not have a blank check." Specter suggested that the
> program's legality be reviewed by a special federal court set up by
> the 1978 Foreign Intelligence Surveillance Act.
> "There are a lot of people who think you're wrong. What do you have to
> lose if you're right?" Specter, R-Pa., asked Gonzales.
Considering the "Alice in Wonderland" aspects of the theory that this wiretapping is legal, I have a feeling they already have a defense planned if it should come down to impeachment:
"But Senator, impeachment requires high crimes or misdemeanors, and illegal wiretapping is a felony, so it doesn't meet the criteria for impeachment" :-).