But how can we in good conscience justify war before we've tested a diplomatic agreement that achieves our objectives; that has been agreed to by Iran; that is supported by the rest of the world; and that preserves our options if the deal falls short? How could we justify that to our troops? How could we justify that to the world or to future generations? In the end, that should be a lesson that we've learned from over a decade of war. On the front end, ask tough questions. Subject our own assumptions to evidence and analysis. Resist the conventional wisdom and the drumbeat of war. Worry less about being labeled weak; worry more about getting it right.

Remarks by the President on the Iran Nuclear Deal at American University in Washington, D.C. (August 05, 2015)

Remarks by the President on the Iran Nuclear Deal | whitehouse.gov[obamawhitehouse.archives.gov]