Until the reports we have seen about the testimony to the Grand Jury become known, we can't know anything for sure. The thing is, the President has painted himself into a corner with anyone that is indicted, and if testimony in the case proves that ANYone in his administration knew ANYthing about this.
He has said that he would get rid of anyone indicted or proven to have known about this situation in his administration. So, either he follows through, or - GASP...he lies. Tough foxhole to be in with this group.
Published reports today have Rove claiming he heard of this from Libby. This, after both said initially that they knew nothing about it. Not saying it's fact, just saying. If they testified to knowing about it in ANY way...you apologists are going to have to come up with a new song and dance.