How about they just swear, go on record, and tell the f-ing truth.
When there's a crime, they should.
This is a fishing expedition. Much like Libby, if we harass & pester long enough, sooner or later someone will say something contradictory to sworn testimony & then they can create a crime.
What does that have to do with all politicians being liars? Expecting any of them to "tell the f-ing truth" is an exercise in futility, isn't it?