Really, thats the only reason you can think of? You seriously lack imagination and basic skills of deduction... Like the more obvious scenario where the agencies were wrapping up an investigation and working with the white house to institute a response in the form of a punishment towards a nuclear armed advisory. I think they had bigger fish to fry then to throw this out to the over politicized congress before all the facts were gathered.Which means he is making it up. In other words, he is a good political hack, doing the dictates of his boss. In other words he'e lying.
Or it's sensitive material that he knows can't be released in a pubic hearing.
In other words...Can they impeach 'Old Grabby' with nothing but classified data?
I guess we'll just have to wait till the FBI finishes, well that is if the 'Great Grabber' doesn't quit first.
The oversight committee is NOT public. Thus anything that is classified is safe to reveal. The only reason to refuse to present it is because there is none to present.
I have a very good imagination, I thought long and hard before I came to the conclusion that the only reasonable conclusion is they have nothing. If you can come up with any other plausible reason please, feel free to elucidate.