Hillary Clinton and Barack Obama are responsible for the growth of ISIS because they precipitously withdrew from Iraq in 2011 against the advice of every single general and for political expediency.

When America does not lead, the world is a dangerous and a tragic place. This is a bad deal. [Barack] Obama broke every rule of negotiation.Yes, our allies are not perfect, but Iran is at the heart of most of the evil that is going on in the Middle East through their proxy.

Distilling truth from overwhelming amounts of information is the essence of leadership.

When we miss with all the metadata collection we've had, the San Bernardino couple and the Tsarnaev brothers, what that suggests to me is that we are using the wrong algorithms to search through all this data.

The most effective way to beat Hillary Clinton is to remind voters of Hillary Clinton's behavior.

As commander in chief, I will not speak to Vladimir Putin until we've set up that no-fly zone; until we've gathered our Sunni-Arab allies and begun to deny ISIS territory; until I've called the supreme leader of Iran and told him new deal - new deal. We the United States of America are going to cut off the money flow, which we can do; which we don't need anyone's permission or collaboration to do.

You know, I believe that marriage is between a man and a woman.