P Chidambaram (Congress leader) has criticized the proposed Constitution (131st Amendment) Bill, 2026, describing it as 'mischievous and diabolical'. He argues that the Bill, which aims to increase the Lok Sabha's strength from 543 to 850 seats, will disproportionately affect southern states, particularly Tamil Nadu. Chidambaram asserts that while Tamil Nadu's representation might appear to increase from 39 to 58, the actual number will likely fall to 46 after the delimitation process. He warns that the representation of southern states in Parliament will decrease from 24.3% to 20.7%, fundamentally altering the federal balance. The Bill is linked to the implementation of a 33% reservation for women in the Lok Sabha starting from the 2029 elections, under the Nari Shakti Vandan Adhiniyam, 2023. The discussions on this amendment are scheduled for a three-day special sitting of Parliament beginning on April 16.