From August 22 to 26, the second Conference of States Parties (CSP2) to the Arms Trade Treaty (ATT) will be held in Geneva. The United States is a signatory of the ATT, in force since December 2014—but as the Obama Administration has not transmitted this treaty to the Senate for its advice and consent, the U.S. is not party to the ATT, which purportedly seeks to regulate the international trade in many conventional weapons. As an observer nation, the U.S. will have an important voice, though no vote, in Geneva.