I don't want to make promises, not knowing what the situation's going to be three or four years out.

For the sake of our children and our future, we must do more to combat climate change.

This doesn't mean abandoning our values and ideals; wherever we can, it's in our interest to help foster democracy through the diplomatic and economic resources at our disposal.

In Missouri, it's a 50/50 state, so I'm kind of used to half the state being mad at me.

Americans coming home, an Iran that has rolled back its nuclear program and accepted unprecedented monitoring of the program -these things are a reminder of what we can achieve when we lead with strength and with wisdom, with courage and resolve and patience. America can do and has done big things when we work together.

We can get this done! Take a vote, and send me that bill.

The Iranian regime supports violent extremists and challenges us across the region. It pursues a nuclear capability that could spark a dangerous arms race and raise the prospect of a transfer of nuclear know-how to terrorists. Its president denies the Holocaust and threatens to wipe Israel off the map. The danger from Iran is grave, it is real.