Let's face it, the subject of campaign finance is not always scintillating. But it's incredibly important.

Ethically, I think pretty much every code of ethics for doctors suggests that they should not be in an interrogation room, particularly if there's anything coercive or abusive going on.

There are some areas where the Kochs are on the same page with [Donald] Trump. He doesn't believe in global warming. He says it's a hoax .

The smaller the office, the more power individuals with big money have.

So in a strange way, even though Trump is a billionaire, what he's been saying is, "Everything's rigged, it's all corrupt and I'm not corrupt because I'm my own billionaire." Both [Donald] Trump and Bernie Sanders made a lot of hay by making that argument.

The book that I wrote is called Dark Money, and it's about secret spending that is very hard to follow. [George] Soros's whole thing is about government transparency, so he spends very much in the open, and the same with [Tom] Steyer.

The concern that I have is that, as wealth continues to concentrate in the hands of a few, economic inequality grows, and power also becomes more unequal.