To the Editor:

Secretary of State John Kerry persisted through difficult negotiations to reach an agreement that verifiably prevents Iran from developing a nuclear weapon for more than a decade while offering it relief from sanctions that will improve the lives of ordinary Iranians and strengthen Iran’s political moderates (nytimes.com, July 14). He deserves the Nobel Peace Prize for his efforts.

Congress now faces its most important foreign policy test since it authorized the invasion of Iraq. Hawks conjure worst-case scenarios about the agreement, but they have no alternative that does not involve far greater risk. Congressional rejection would explode global consensus on sanctions, while an American or Israeli military strike would unleash chaos and an Iranian underground race to the bomb.

Will moderates in Congress show wisdom and courage?

DAVID KEPPEL

Bloomington, Ind.

Note from KBJ: Israel will take care of Iran's nuclear bombs when the time comes.