Really? You do the investigation and if you find evidence then you do something about it. It's kind of fundamental to the US system of justice. I guarantee their investigation will hurt, because that is its real purpose. You've done nothing wrong would it be ok for us to comb through your every communication and detail of you life till we find something we don't like?
Endless investigations always hurt anyway because it takes away from the actual work that Congress is elected to do. Not that the GOP actually wants to do anything. And as we have seen these sorts of investigations are used to hurt opponents, even though they have done nothing wrong or even done the right thing. For example Durham's idiotic investigations. Durham and his investigation was a total failure but they did harm to the people involved who didn't deserve it.