We need a very robust way of looking at people coming into the country... We're focused on the whole concept of the ideology and of the vetting.

In Syria, while secretary of state, Clinton watched as United Nations resolution after U.N. resolution failed. She accomplished nothing except to repeat the refrain, 'Assad must go.'

I started my career in the U.S. military. Traditionally, in the military... you either start with a technical background or a more leadership-focused one. I took the leadership path.

My experience in decision-making has shown that patterns are tough to break. In the military, we study an opponent, looking for gaps, flaws, or weaknesses that can be exploited. Successful leaders at all levels in all disciplines conduct this kind of analysis.

The words spoken by the leader of the free world can expand the frontiers of freedom or shrink them. When Ronald Reagan called on Gorbachev to 'tear down this wall', a surge of confidence rose that would ultimately breach the bounds of the evil empire.

I do know a lot about Scientology. And I know about the practices. I know all about what the technology is and all that kind of stuff. It's very helpful.

What I found over the years is the most important thing is for a team to come together over a compelling vision, a comprehensive strategy for achieving that vision, and then a relentless implementation plan.

Time and again we see leaders and members of religions incite aggression, fanaticism, hate, and xenophobia - even inspire and legitimate violent and bloody conflicts.