The Ending Double Dealing Act of 2026 is designed to enhance U.S. national security by preventing the Department of Defense from engaging consulting firms that have connections to foreign entities considered adversarial, such as the governments of China and Russia. This legislation aims to eliminate potential conflicts of interest that could jeopardize U.S. interests. The Act prohibits the Department of Defense from entering into contracts or grants with consulting firms that have worked with specified foreign adversaries in the past five years.