It would be a great opportunity for the Republicans on the committee to grill him on why he had only partisan democrats working under him. And to get him on record saying that he never looked into whether Hillary or any other dems may have colluded with the Russians. And get him testifying under oath about the FISA applications being based on fraud and fabrications.
Yep, all upside for the GOP. It's like putting the accused on the stand.