The Wall Street Journal | Laurence Norman: Argentine diplomat Rafael Grossi was strongly supported by U.S.

The United Nations’ atomic agency’s board picked a new leader Tuesday with strong U.S. backing who has pledged to shake up the body and strictly monitor Iran’s nuclear activities.

Argentine diplomat Rafael Grossi, 58 years old, is likely to be formally elected when he receives the backing of the International Atomic Energy Agency’s full membership, which is expected in the next few weeks.

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