We learn from our mistakes, we do some reflection, we lick our wounds, we brush ourselves off - then we go forward, with the presumption of good faith in our fellow citizens.

The greatest threat to U.S. and global security is no longer a nuclear exchange between nations, but nuclear terrorism by violent extremists and nuclear proliferation to an increasing number of states.

One of the things you discover about being president is that there are all these rules and norms and laws and you got to pay attention to them.

But the question is, do we care enough? Do we care enough to keep standing up for the country that we know is possible, even if it's hard, and even if it's politically uncomfortable? Do we care enough to sustain the passion and the pressure to make our communities safer and our country safer? Do we care enough to do everything we can to spare other families the pain that is felt here today?

The authorization I propose would provide the flexibility to conduct ground combat operations in other more limited circumstances, such as rescue operations involving U.S. or coalition personnel or the use of special operations forces to take military action against ISIL leadership, it would also authorize the use of U.S. forces in situations where ground combat operations are not expected or intended, such as intelligence collection and sharing, missions to enable kinetic strikes or the provision of operational planning and other forms of advice and assistance to partner forces.

Let us remember that we can do these things not just because of wealth or power, but because of who we are: one nation under God, indivisible, with liberty and justice for all.

I have to make the very best judgments I can make in terms of what's gonna keep the American people safe. And is what, what's gonna uphold our Constitution and our traditions of due process.