The administration disagrees. The main purpose of the treaty is to "stem the international, illegal and illicit trade in conventional weapons that benefits terrorists and rogue agents," said the official, who was authorized to anonymously announce the planned signing.
"The treaty recognizes and protects the freedom of both individuals and states to obtain, possess and use arms for legitimate purposes," the official said. The United States already has strict export controls, "which haven't diminished one iota the ability of Americans to enjoy their rights under our Constitution."
Amnesty International, which has been a leading sponsor of an international campaign to stem the international arms trade to human rights abusers, said "all Americans should celebrate" the decision to sign the accord.
The treaty will go into effect once it is signed and ratified by at least 50 U.N. member states. The United States will be the 89th country to sign the treaty, which was adopted in a 153-to-3 vote, with 20 abstentions, in April.
Syria, North Korea and Iran, the three countries that voted against it, are all under international arms sanctions. The 20 abstentions included Russia and China, the world's largest arms exporters along with the United States. Russia is Syria's main arms supplier, China is North Korea's, and North Korea itself is a weapons exporter.
Only four countries have ratified the treaty: Iceland, Nigeria, Guyana and the Caribbean island state of Antigua and Barbuda. Ratification in the U.S. requires a two-thirds vote of the Senate, where many Republicans and some Democrats are strongly opposed, and the administration is unlikely to submit it in the near future.
In a General Assembly address Tuesday, Nigerian President Goodluck Jonathan called the weapons trade a primary source of internal and cross-border violence in Nigeria and throughout West Africa.
Weapons covered in the treaty include but are not limited to battle tanks, armored combat vehicles, large-caliber artillery systems, combat aircraft, attack helicopters, warships, missiles and missile launchers, and small arms and light weapons.