Put his ass in jail for starters!
http://www.therightscoop.com/darrell-issa-wiretaps-reveal-holder-and-doj-knew-about-gunwalking/
How do you propose they do that, exactly?
"Jail" requires prosecution. The Congress cannot prosecute -- their powers are investigatory only.
At this stage, prosecution would involve the appointment of a special prosecutor. The President must first approve the appointment of a special prosecutor. Whereupon, the Attorney General would appoint same.
So, how do you propose Congress go about "throwing his ass in jail", exactly?
The furthest Congress itself may go is issuing a Contempt of Congress charge -- which would have no reference to the crimes actually committed, only to the stonewalling that Holder is practicing.
Depending on the evidence Issa has assembled, now might be the time to do that. Or it may not...