I may be in error, but doesn’t a pardon imply the commission of a crime and the acknowledgment of same by the individual pardoned?
Does anyone believe a Clinton is about to do that?
The President (and most governors) can pardon anyone they choose. They don’t need the agreement or even acquiescence of the person being pardoned.
As others have noted, I suspect a person with a full pardon loses the right to not incriminate himself. Since he can’t, he’s already been pardoned and cannot be prosecuted.