Tamil Nadu Finance Minister Palanivel Thiaga Rajan on August 3, hit back at Union Minister Nirmala Seetharaman’s criticism of Tamil Nadu Government on various issues. “We sent a written submission that we opposed the hike...we have the most complex GST model among 140 countries with thousands of flaws. It operates with lack of meetings; GST Council is a rubber stamp. It is anything but federalism,” he said.