Christopher Krebs:

Yes, I think we need to keep in mind that, given the way that we're connected, and given the way we consume and use and share information, there's a broad range of opportunities for any nation state, whether it's Russia or China, to try to influence the way Americans think and they act.

And so the Russians, I think, have been historically — or at least most recently — much noisier, much more out in front. They have attempted to get into election equipment and manipulate there. They have also used social media to sow discord and divisiveness.

The Chinese are much more strategic, much more under the radar perhaps, with a longer, more strategic game in play. And their attempts here are to influence the way the Americans think about policy issues.

And down the road, whether it's the '18, but also more for the midterm — or — I'm sorry — the 2020 presidential, trying to influence how voters, when they go to the polls, what — what bubble they're going to fill in and what button they're going to push.