Attorney General Jeff Sessions revealed Thursday that Utah’s top federal prosecutor, John Huber, is investigating a cluster of Republican-driven accusations against the FBI and has decided that no second special counsel is needed — at least for now.

Huber has been looking into allegations that the FBI abused its powers in surveilling a former Trump campaign adviser, and more should have been done to investigate Hillary Clinton’s ties to a Russian nuclear energy agency, but his identity had remained a secret.

But Sessions’ decision to stop short of formally appointing a special counsel like Robert Mueller, detailed in a lengthy written response to three Republican chairmen on Capitol Hill, will likely anger those in the GOP who have recently ramped up calls to investigate claims of political bias at the nation’s top law enforcement agencies.