Because -- and I think your question reflects this -- the best way to ensure that Iran does not acquire a nuclear weapon is for this course of action, to work, and for Iran to make the strategic decision to forsake its nuclear weapons ambitions and to fulfill its international obligations.

WHITEHOUSE: Press Gaggle aboard the Press Bus en route Davenport, IA

If they make a decision to fulfill their responsibilities and obligations, then the international community would welcome that.

WHITEHOUSE: Press Briefing