That we are in the midst of crisis is now well understood. Our nation is at war, against a far-reaching network of violence and hatred. Our economy is badly weakened, a consequence of greed and irresponsibility on the part of some, but also our collective failure to make hard choices and prepare the nation for a new age. Homes have been lost; jobs shed; businesses shuttered. Our health care is too costly; our schools fail too many; and each day brings further evidence that the ways we use energy strengthen our adversaries and threaten our planet.

America, we weaken our ties when we allow our political dialogue to become so corrosive that people of good character aren't even willing to enter into public service; so coarse with rancor that Americans with whom we disagree are seen not just as misguided but as malevolent. We weaken those ties when we define some of us as more American than others, when we write off the whole system as inevitably corrupt, and when we sit back and blame the leaders we elect without examining our own role in electing them.

On the one hand information is moving quick or the way in which people consume information is changing so fast. Clearly this worked for [Donald Trump], and it gives him a direct connection to a lot of the people that voted for him.

I applaud the Supreme Court’s decision to strike down the Defense of Marriage Act. This was discrimination enshrined in law. It treated loving, committed gay and lesbian couples as a separate and lesser class of people. The Supreme Court has righted that wrong, and our country is better off for it. We are a people who declared that we are all created equal - and the love we commit to one another must be equal as well.

I do think Brexit vote speaks to the ongoing changes and challenges that are raised by globalisation.

The interesting thing about the African-American experience in this country is that we are sort of a mongrel of people. I mean we're all kind of mixed up.

For the first time, preventing nuclear proliferation and nuclear terrorism is now at the top of America's nuclear agenda.