In a historic legislative setback, the Constitution (131st Amendment) Bill, 2026 was defeated in the Lok Sabha on April 17, 2026, falling short of the two-thirds special majority required to amend the Constitution. The Bill received 298 votes in favour and 230 against; the threshold for passage of a constitutional amendment is two-thirds of members present and voting, which on the day worked out to 352 of the 528 members who voted. This is the first time during the Modi government's tenure that a Constitution Amendment Bill failed in the Lok Sabha. The Bill packaged three major proposals together. First, it sought to raise the maximum strength of the Lok Sabha from 543 to 850, with up to 815 members from states and up to 35 from Union Territories. Second, it sought to operationalise the one-third women's reservation introduced by the 106th Constitutional Amendment, 2023 (Nari Shakti Vandan Adhiniyam), which had been linked to the next delimitation exercise. Third, it was twinned with the separate Delimitation Bill, 2026, which provided that the latest published Census on the date of the Delimitation Commission's constitution would be used. The opposition INDIA bloc voted as a unified block, with southern parties leading the resistance on the ground that population-based delimitation would disproportionately reduce the political weight of southern states that have implemented family-planning more effectively. Union Home Minister Amit Shah replied to the discussion before the vote. Following the constitutional amendment's defeat, the government withdrew the Delimitation Bill, 2026.