The Iranian people are getting restive because of the challenges that sanctions have posed to their economy.

You know, there are certain things that make for good sound bites but don't always translate into good policy.

And let me say this as a politician I can promise you this, political leaders will never take risks if the people do not push them to take some risks. You must create the change that you want to see.

The path towards sustainable energy sources will be long and sometimes difficult. But America cannot resist this transition, we must lead it.

I think if you worked at the community level in Chicago and then a politician on the South Side of Chicago, and worked at the state level, then you're pretty familiar with all the variations of politics in the African American community and criticisms you may get. If you're not familiar with those or you don't have a thick enough skin to take it, then you probably wouldn't have gotten here.

The good news is that the Paris Agreement is not just a bilateral agreement between the United States and some other country. You have 200 countries who came together. It's an international agreement.

We must begin by acknowledging a hard truth. We will not eradicate violent conflict in our lifetimes. There will be times when nations, acting individually or in concert, will find the use of force not only necessary but morally justified.