Secretary Gates and U.S. Ambassador to Mexico Carlos Pascual attend the Merida Initiative Plenary. Secretary of Defense Robert M. Gates and U.S. Ambassador to Mexico Carlos Pascual attend the Merida Initiative Plenary, which focuses on helping the Mexican government fight drug-trafficking cartels and other security threats. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 031961-J-GBB12-657.jpg Photo Gallery