Unless they push this to a Senate trial and they subpoena it.
No need to wait for a trial. The GOP controlled Senate can gather these facts at any time by requesting the testimony of the ICIG. That they are not makes them co-conspirators in the ongoing coup and no less.
We will see, Eeyore. There are three senate investigations going on right now. But wouldn't it be better in a trial format? Yes, it would.