Even though New York is the safest big city in the nation, there are still far too many illegal guns on our streets. Nearly all of them arrive from out of state - and most are sold by a small group of rogue gun dealers who refuse to obey federal laws.

I tend to be reasonably blunt, maybe a little bit too much. But I just- I always respected people that tell the truth. And I've always wanted people to tell me the truth.

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.

The press really is not doing its job of holding their [the candidates'] feet to the fire. ... The tough questions are not what are you in favor of, but how are you going to get it through Congress?

I do think there are certain times we should infringe on your freedom.

Central planning didn't work for Stalin or Mao, and it won't work for an entrepreneur either.

I think both of them [Donald Trump and Bernie Sanders] have [chances] because they are not the establishment, not for who they are.