Trey Gowdy is a Congressman who would prefer not to use the office for prosecution. To the extent the DOJ is currently compromised, it will take a while for justice to issue forth. But it will.
Congress has no prosecutorial powers. FR has been reminded of this time and time again. A tongue lashing is the worst a single congressman can do. Collectively they can do a lot to plug holes, but they can’t pass retroactive laws (ex-post facto).