Leadership is not about a title, degree or level. Anybody can lead at any time.

National security is a place where the private sector could be helpful because the government is woefully behind the technology curve. But secondly, the bureaucratic processes that have been in place since 9/11 are woefully inadequate as well.

I think leadership of any kind requires trust and transparency and voters should demand no less from their political leadership in government.

We must have Sunni-Arabs involved in this coalition [against ISIS]. We must commit leadership, strength, support and resolve.

I have met Vladimir Putin, and I know his ambition will not be detoured by a gimmicky red, reset button.

The truth is, I was afraid the day I walked into Stanford. And I was afraid the day I walked out.

As president, I will stand up to the great human rights tests of our time - in China, Russia, and the Middle East. We must send a signal to our allies and adversaries that America is back in the leadership business.