Kerry spoke Wednesday in response to Benjamin Netanyahu's criticism of the deal to U.S. Congress the day before.
The secretary of state says if talks are successful, the deal being negotiated will "achieve the goal of proving that Iran's nuclear program is and will remain peaceful."
Picking up on President Barack Obama's comments, Kerry says "no one has presented a more viable lasting alternative for how you actually prevent Iran from getting a nuclear weapon."
Kerry spoke at the end of several meetings with Iranian Foreign Minister Mohamad Javad Zarif and ahead of consultations with Arab and European U.S. allies.

Secretary of State John Kerry at a news conference after he delivered remarks to the United Nations Human Rights Council in Geneva Monday. (AP Photo/Evan Vucci)
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