Barack Obama: “Such horrific acts of violence will only strengthen our resolve.”

And I will fight for that, even if I don’t always think it’s going to win.

I think when we act on that basis, it doesn't always work out, but over time things do get better.

It is a decision about how do we face and embrace this finite amount of time we have on the planet.

It is a basic principle of American democracy that the government can’t selectively target individuals simply because of their political beliefs or what they say.