In a world of complex threats, our security and leadership depends on all elements of our power - including strong and principled diplomacy.

It's useful for activists just to be out there to keep you mindful and not get complacent, even if ultimately you think some of their criticism is misguided.

Both of our nations [America and Germany] were proud to join the Paris Climate Agreement which the world should work to implement quickly. Continued global leadership on climate in addition to increasing private investment and clean energy is gonna be critical to meeting this growing threat.

Money is the original sin in politics and I am not sinless.

I think there are a whole host of things that are civil rights, and then there are other things - such as traditional marriage - that, I think, express a community's concern and regard for a particular institution.

The brain is a body part too; we just know less about it.

Too many Americans who struggle with mental health illnesses are suffering in silence rather than seeking help, and we need to see to it that men and women who would never hesitate to go see a doctor if they had a broken arm or came down with the flu, that they have that same attitude when it comes to their mental health.