NEW DELHI: Gujarat chief minister Narendra Modi and his Tamil Nadu counterpart J Jayalalithaa joined hands on Saturday to tear into UPA-II's policies, accusing the Centre of weakening the country's federal structure and step-motherly treatment meted out to non-Congress-ruled states. The frontal assault from the platform of NDC, convened to approve the Approach Paper for the 12th Five Year Plan, on the Congress-led UPA government led Prime Minister Manmohan Singh to deny the charge.