I never respond to Donald Trump's personal insults about me. I could care less what he says about me. I'm going to respond when he calls a judge unqualified because of his Mexican heritage, or mocks a reporter with a disability, or says demeaning things about women. And the list goes on.

I have a lot of experience dealing with classified material, starting when I was on the Senate Armed Services Committee going into the four years as secretary of state.

There cannot be true democracy unless all citizens are able to participate fully in the lives of their country.

People support me because they know me. They know my life's work. They have worked with me and many have also worked with Senator [Bernie] Sanders. And at the end of the day they endorse me because they know I can get things done.

George W. Bush made the agreement about when American troops would leave Iraq, not Barack Obama.

Our challenge is much more pervasive than it would be if we were just facing one enemy in one place. [Instead there is] the Middle East, Iraq, North Korea, Iran. There's a relatively long list that we believe are linked to the al Qaeda network in the Philippines, in Indonesia and in Yemen and other places. That makes it very clear that this is a global network.

There's no doubt now that Russia has used cyber attacks against all kinds of organizations in America, and I am deeply concerned about this.