David Sanger:

I not only came away convinced that it happened, but I came away convinced that we missed huge numbers of signals running up to it.

There are four chapters in the book on Russia. But the first one starts in Ukraine. And it's called "Putin's Petri Dish," because, basically, every single thing the Russians did us, they tried out in Ukraine first. And we didn't have the imagination to think that they would take that and try it here.

The second thing was, the FBI was way too slow on the investigation into what happened at the DNC. It took nine months before they really got everybody to wake up to it. And, even then, the British had to step in and warn us that Russian military intelligence was inside the DNC.

And then the White House got involved in a lengthy internal debate about whether to call out President Putin. Once again, they made the decision that they had made when the Russians went into the White House, the State Department, and the Joint Chiefs of Staff, not to publicly penalize the Russians, at least before the election.