Has a GOP-controlled congressional committee uncovered any actual evidence in the past 20 years or so?

I take notice of whenever they have a new hearing or investigative issue, and each one I can remember has always been “let’s go on a fishing expedition to find dirt or at least impugn the character of a political rival” followed a year later by a Friday-night quiet disbanding of the committee with no findings, or a report being issued that says nothing of importance whatsoever.