They just want to find out what other secrets he is hiding, so damage control for Empress Hillary and the Dems can be conducted.
It helps to put things in context. Wilkinson set up her “boutique” law firm around then and immediately had four of Hillary’s aides as clients. If that isn’t telling nothing is. Clinton probably knew the fecal material was about to hit the fan so she, quick like a bunny, made arrangements for the legal representation.
The point here is Guccifer is deadly to her adn Blumenthal. That was not predictable. Ultimately Guccifer and the info he ratholed in the cloud will be the straw that breaks Hillary’s back. Not only did he capture her emails, he’s more than likely the one that tipped the FBI to the existence of her private server two years ago.