New York has been, and will continue to be, a magnet for people from all over the world. This is where the arts, business, research and technology converge to create the world's foremost urban economy.

I thought Jeb Bush would have made a good president. He was on the board of my foundation. He's very conservative, much too conservative for me.

[Jeb Bush] could, as I describe it, run the railroad.[John] Kasich could run the railroad. Hillary Clinton can run the railroad. Running the railroad is the most important thing. You have got 4 million employees; you've got to make the system work, and it doesn't work very well.

Look, we live in a very dangerous world. We know there are people who want to take away our freedoms. New Yorkers probably know that as much if not more than anybody else after the terrible tragedy of 9/11.

Fifty percent of the world's population lives in cities. In a couple of decades, 70 percent of the world's population will be living in cities. Cities are where the problem is. Cities are where the solution is, where creativity exists to address the challenges and where they have most impact. This is why, in 2005, the C40 was founded, an organization of cities that address climate change. It started with 18 cities; now it's 91. Cities simply are the key to saving the planet.

Buy what's deliverable, not what could be.

Stubborn isn't a word I would use to describe myself; pigheaded is more appropriate.