And it is American diplomacy, backed by pressure, that has halted the progress of Iran's nuclear program - and rolled parts of that program back - for the very first time in a decade. As we gather here tonight, Iran has begun to eliminate its stockpile of higher levels of enriched uranium. It is not installing advanced centrifuges. Unprecedented inspections help the world verify, every day, that Iran is not building a bomb. And with our allies and partners, we're engaged in negotiations to see if we can peacefully achieve a goal we all share: preventing Iran from obtaining a nuclear weapon.