I think Republicans really need to be disciplined, to stay focused on sustained economic growth.

We need to destroy ISIS in the caliphate. That's - that should be our objective. The refugee issue will be solved if we destroy ISIS there, which means we need to have a no-fly zone, safe zones there for refugees and to build a military force.

I do have the strength. Leadership, leadership is not about attacking people and disparaging people. Leadership is about creating a serious strategy to deal with the threat of our time.

I have said that Mr. Trump's language is divisive.

The main thing we should be focused on is the strategy to destroy ISIS. And I laid out a plan that the Reagan Library before the tragedy of Paris, and before San Bernardino to do just that. It requires leadership, it's not filing an amendment and call it a success.

There's a fine line between stubbornness and the positive side of that, which is dogged determination.

I don't think it's the highest priority. I don't think we should ignore it, either, just generally I think as conservatives we should embrace innovation, embrace technology, embrace science. ... Sometimes I sense that we pull back from the embrace of these things. We shouldn't.