Climate change constitutes a serious threat to global security.

Our resources may be finite, but our will is infinite, and I am confident that if we come together and summon that great American spirit once again, we will meet the challenges of our time and write the next great chapter in our American story.

I think you need to have people around you who can remind you that, actually, what you just said makes no sense. Fortunately, I have my wife to do that continually.

It's important to recognize that you can't have 100 percent security and also then have 100 percent privacy and zero inconvenience.

Our job is not to ask that God respond to our notion of truth. Our job is to be true to Him, Hi-His word and His commandments, and we should assume humbly that we're confused and don't always know what we're doin' and we're staggerin' and stumblin' towards him and have some humility in that process.

The system isn't working when 12 million people live in hiding, and hundreds of thousands cross our borders illegally each year; when companies hire undocumented immigrants instead of legal citizens to avoid paying overtime or to avoid a union; when communities are terrorized by ICE immigration raids -- when nursing mothers are torn from their babies, when children come home from school to find their parents missing, when people are detained without access to legal counsel. When all that's happening, the system just isn't working.

As president of the United States, I don't bluff.