I'm a grinder....I've never taken more than a week off in my adult life. I truly believe work is a virtue, it gives you purpose.

The Russians and rogue actors, including ISIS - this is a serious part of the 21st century security challenge that we face.

But without a caring society, without each citizen voluntarily accepting the weight of responsibility, government is destined to grow even larger, taking more of your money, burrowing deeper into your lives.

We need to focus on building a military that is second-to-none ... so that we can destroy Islamic terrorism.

Barack Obama became president, and he abandoned Iraq. He left, and when he left Al Qaida was done for. ISIS was created because of the void that we left, and that void now exists as a caliphate the size of Indiana.

I kind of know what my job is, it's to develop a message that's hopeful and optimistic about the future of the country, to develop ideas that will give people a sense that they can lift up, and to tell them about my leadership skills to make it so.

Marco [Rubio] is a gifted politician. He is incredibly gifted. And he needs to be able to do his job. He's going to be a great candidate [for presidency], for sure. But I think - he's a United States senator. He ought to show up.