It doesn't matter who it is, what position that they hold, or how high up the ladder they are. If you see that there could be even an inkling of corruption that will shift the way that anything will be organized, processed, or ran, it needs to be investigated. The POTUS is included in the people that needs to be investigated as well. He is not exempt from that because of his title and influence on politics. And if it comes to the light that Trump has done something that is corrupt, he needs to be held accountable.