"Jayalalithaa is doing it for the sake of politics. This is nothing but politically motivated. Legally it (forming the Board) cannot be done," Siddaramaiah told reporters in a sharp reaction to Jayalalithaa's letter to Prime Minister Narendra Modi.
Both Jayalalithaa and Siddaramaiah have met the Prime Minister making out their case recently with Karnataka also taking an all party delegation to Modi to resist any move for constituting the Board.
Writing another letter to Modi today in an apparent move to pile pressure on the Centre, Jayalalithaa said "...The Constitution of the Cauvery Management Board is not optional but an integral part of the final order (of the Cauvery tribunal) itself."
Jayalalithaa's letter comes a day after Union Water Resource Minister Uma Bharti said the proposal for setting up the Board was never there and there was no direction from the Supreme Court.