I'm not sure having police investigating our elected officials is such a good thing. If you look at corruption investigations of high level officials in history

I'm not sure having police investigating our elected officials is such a good thing. If you look at corruption investigations of high level officials in history, they are very frequently partisan attacks. For example, the investigation into Lula da Silva turned out to have been driven by a group of right wing judges and prosecutors that had his ouster as a goal, not justice. It's not even a question of whether corruption happens! Of course it does. E.g. maybe Lula did some kind of wrongdoing. However frequent and highly publicized corruption investigations put the power in the hands of police, prosecutors and judges and takes it away from democratic means. Frankly, I'd rather have a little bit of corruption than allow police to say who is an acceptable leader. Part of the issue is that there is a lot of grey area in what even counts as corruption. What counts as "violating the constitution" is even greyer, especially in the US where the constitution itself is short, vague and poorly phrased leaving decisions on what is constitutional to be a political question in itself.