If there is reason to believe there is a there, there, investigate the investigators.
At some point, there have to be people who do their job, regardless, who value their integrity and the integrity of their mission over partisan politics. If we aren't there yet, keep canning them until we get there. If we are 'there' get out of the way and let them do their job. In the end, the results of any investigation (research) speak as much or more about the integrity of the person doing the work as the subject of the investigation.