The very technologies that empower us to do great good can also be used to undermine us and inflict great harm.

The real problem, if you look at how, for example, Hezbollah got a lot of missiles that are a grave threat to Israel, it's not because they were legal, it's not because somehow that was authorized under international law; it was because there was insufficient intelligence or capacity to stop those shipments.

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

The challenge there is that ISIL doesn't have an air force, so the damage done there is not against ISIL, it's against the Syrian regime.

These kinds of tragedies [like shooting in Fort Lauderdale] have happened too often during the eight years that I've been president. The pain, the grief, the shock that they must be going through is enormous. I've asked me staff to reach out to the mayor down there and make sure that coordination between the state and local officials is what it should be. But I think we'll find out over the next 24 hours exactly how this happened and what motivated this individual.

The problem was, and we saw some of this in the immigration-reform issues as well, was they hadn't done sufficient homework to know that I didn't have all the capacity they thought I did in order to just execute this through the stroke of a pen.

Our government shouldn't make promises we cannot keep, but we must keep the promises we've already made.