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The human rights group Amnesty International also hailed the Obama administration’s plan to sign the treaty.

“All Americans should celebrate that the United States has pledged to do its part to end the unscrupulous trade in deadly weapons used by dictators, war lords and criminal gangs to commit atrocities,” said Frank Jannuzi, deputy executive director of Amnesty’s U.S. operations.

“This treaty is simple but profound. It says that nations must not export arms and ammunition where there is an ‘overriding risk’ that they will be used to commit serious human rights violations,” Mr. Jannuzi said. “It will help keep arms out of the hands of the wrong people: those responsible for upwards of 1,500 deaths worldwide every day.”