If, technologically, it is possible to make an impenetrable device or system where the encryption is so strong that there's no key - there's no door at all - then how do we apprehend the child pornographer? How do we solve or disrupt a terrorist plot?

Let's face it, Fox News, you'll miss me when I'm gone. It'll be harder to convince the public that Hillary Clinton was born in Kenya.

This is the moment when we must build on the wealth that open markets have created, and share its benefits more equitably. Trade has been a cornerstone of our growth and global development. But we will not be able to sustain this growth if it favors the few, and not the many.

On issues like Ukraine, on issues like Syria, we've had very significant differences [with Russia].

When it comes to the budget, we know that we shouldn't be cutting more on core investments, like education, that are going to help us grow in the future. And we've already seen the deficit cut in half. It's going down faster than any time in the last 60 years. So why would we make more cuts in education, more cuts in basic research? Nobody thinks that's a good idea.

But shouldn't we also quit marketing murder as a game?

The thing about hip-hop today is it's smart, it's insightful. The way they can communicate a complex message in a very short space is remarkable.