I remember having meetings with Republican senators who initially had been trying to engage [Obamacare] but saw that the politics of 'no' were growing inside the Republican Party.

If we want to really reduce foreign influence on our elections, then we better think about how to make sure that our political process, our political dialogue is stronger than it's been.

The forces that divide us are not as strong as those that unite us.

If we're not vigilant foreign countries can have an impact on the political debate in the United States in ways that might not have been true 10, 20, 30 years ago in - in part because of the way news is transmitted and in part because so many people are skeptical of mainstream news organizations that - everything's true and everything's false.

The president and the executive branch are always going to have greater latitude and greater authority when it comes to protecting America because sometimes you just have to respond quickly and not everything that is a danger can be publicized and be subject to open debate, but there have to be some guardrails.

We have to deal with the 11 million individuals who are here illegally. The bill that Senator [Marco] Rubio put forward, I think is a great place to start.

The issue of climate change is one that we ignore at our own peril. There may still be disputes about exactly how much we're contributing to the warming of the earth's atmosphere and how much is naturally occurring, but what we can be scientifically certain of is that our continued use of fossil fuels is pushing us to a point of no return. And unless we free ourselves from a dependence on these fossil fuels and chart a new course on energy in this country, we are condemning future generations to global catastrophe.