Contempt of Congress.
You can jail him at that point, indefinitely. He can also be replaced legitimately at that point.
The interesting bit is whether Wray would also be jailed.
I think the way its going to work is RR is jailed, Wray releases the docs.
Docs show RR is directly implicated, everybody concludes the same thing (’No wonder!’), and the dam begins to break.
RR may be the only thing holding back all that water at this point.
A RR and Mueller meme running out of fingers and toes to stop the leaks in the dyke would be cool right now. IMO