Even if there was truth to it (I do think a genteel corruption was in play but not to this extent), these arguments are being made in bad faith. There's no concern for actual corruption as they don't seem to care when it happens in any other context -- it's just "gotcha" politics.
US foreign policy in its very nature is corrupt (it's the lobbying arm of big business). Let's shine a light on it but that light needs to be colorblind to red and blue.
Without recognition of the corruption of the previous administration this dialog is simply partisan pandering. I'd be more than happy to share my criticisms for the administration and its party (including this aforementioned corruption) but if your concern does not cross party lines then it's no concern of mine.