The Arms Export Control Act (AECA, 22 U.S.C. § 2751) is a 1976 federal law that authorizes the president to sell defense articles and services to foreign governments but requires notification to Congress for sales above certain thresholds. For sales of major defense equipment over $25 million or defense services over $50 million, Congress has 30 calendar days to pass a joint resolution of disapproval in both chambers to block the sale. A joint resolution of disapproval is privileged, meaning it cannot be filibustered and requires only a simple majority. However, the president can invoke emergency authority under Section 36(b) to bypass the 30-day review period entirely.