There are institutional obligations I have to carry out that are important for a president of the United States to carry out, but may not always align with what I think would move the ball down the field on the issues that I care most deeply about.

I think it's really important to enlarge the issue behind abortion. I have been serving for over two decades and I have seen year in and year out largely the Republicans voting against women's contraception, family planning.

It's not surprising then they get bitter, they cling to guns or religion or antipathy to people who aren't like them, or anti-immigrant sentiment, or anti-trade sentiment, as a way to explain their frustrations.

It would be naive of me to suggest that with Russia committed militarily, as it is, to supporting what in many cases are barbarous tactics by the Assad regime to crush the opposition.

I've been involved in the intelligence side of the federal government for a long time. We all know that we have to have a balance between security to protect the American people and liberty. We take an oath to protect and defend the constitution and the American people.

The system isn't working when 12 million people live in hiding, and hundreds of thousands cross our borders illegally each year; when companies hire undocumented immigrants instead of legal citizens to avoid paying overtime or to avoid a union; when communities are terrorized by ICE immigration raids -- when nursing mothers are torn from their babies, when children come home from school to find their parents missing, when people are detained without access to legal counsel. When all that's happening, the system just isn't working.

The president does not have power under the Constitution to unilaterally authorize a military attack in a situation that does not involve stopping an actual or imminent threat to the nation. As commander in chief, the president does have a duty to protect and defend the United States. In instances of self-defense, the president would be within his constitutional authority to act before advising Congress or seeking its consent.