Barack Obama actually said...

Rules must be binding, violations must be punished, words must mean something, the world must stand together to prevent the spread of these ...

the threat of a terrorist acquiring and using a nuclear weapon is the most immediate and extreme threat we face.

We must harness the power of nuclear energy on behalf of our efforts to combat climate change, and to advance peace and opportunity for all ...

The pledge is to evaluate whether or not more steps will be needed in the future to address the breadth and severity of the crisis.