The human and environmental devastation caused by nuclear weapons - whether by testing, mistake or malice - is the very reason we need to eliminate them altogether.

The human and environmental devastation caused by nuclear weapons - whether by testing, mistake or malice - is the very reason we need to eliminate them altogether.

These are issues we've been grappling with since the Constitution was written: how you hold your government to account for its words and deeds. It's all about power and the abuse of power.

It's lonely. That's why, in many ways, the CIA is the world's biggest dating agency, I think. I imagine it's much like two actors that get married because they understand that universe. You know, I'm pretty sure the agency's divorce rate is rather high.

I think it's the height of patriotism to continue to exercise your right as a citizen and to hold your government to account. Isn't that what the very essence of democracy is about?

We have known Hillary Clinton both professionally and personally for close to 20 years, dating back to before President Bill Clinton's first trip to Africa in 1998 - a trip that they both acknowledge changed their lives and gave considerable meaning to their post-White House years and to the activities of the Clinton Foundation.