For any good organization to function, there needs to be some type of internal accountability. Government agencies especially need some type of internal affairs or ethics committee to ensure that everything is on the up and up and people in positions of power aren't (gasp) abusing their power. I know, it seems crazy that anyone would do such a thing because humans have such incredible track records of doing the right thing, always, but ethics committees are a necessity.
So when word broke out about Donald Trump's alleged connections with Russia, that gave U.S. Intelligence agencies cause for alarm to go and investigate how deep of a relationship Trump has with the Russian government - and it turns out it's pretty freaking deep.
But the thing is, if an official investigation is being launched on the former reality star turned U.S. President, then it needs to be handled the correct way. Meaning you can't have people who are in Trump or his opponent's pocket. This means it needs to be left up to the bipartisan House Ethics Committee.