As world leaders met at the United Nations General Assembly in New York, US Secretary of State John Kerry signed the Arms Trade Treaty, calling it a “significant step” toward global security. Passed by the UN last April, the treaty is designed to track and regulate trade in tanks, combat vehicles and aircraft, warships, missile and artillery systems, small arms and light weapons. The US, which is the largest arms exporter in the world, must now ratify the treaty in Congress, where some lawmakers have voiced opposition. For more we’re joined by Rachel Stohl, senior associate at the Stimson Center. She was also a consultant at the UN for the arms trade treaty.

To listen to the full interview, click here.