The HOUSE is the ONLY body constitutionally assigned to impeach (formal charges) a high government official (US Const. Art. I, Sec. 2, Cl. 5). Thus, it should be the HOUSE that hires investigators and prosecutors for impeachment issues. If there is reasonable suspicion that FBI officials are corrupt, then the HOUSE should investigate and charge if/when probable cause is found.
_____________
WHAT does the HOUSE do when the FBI and others drag their feet for seven years or so to turn over documents........... and when they get them they are deeply redacted. WHAT?
The answer may have been the Congress at one time...... who knows what it is NOW? But it is not the Congress as now constituted.