Barack Obama: “We've long said the mere presence of chemical weapons in the region undermines stability.”

Your task is not to impose litmus tests.

I think when you understand the complexities of America and the contradictions of America, I don’t think it makes you love it less. I think it makes you love it more.

That's what I hope every visitor to this center takes away from their experience.

There’s no doubt that we are going through a period right now of disruption, polarization.