Former president Ram Nath Kovind, who headed a panel on 'one nation, one election,' on Saturday said the idea of simultaneous polls was perceived by the framers of the Constitution and therefore it cannot be unconstitutional. Kovind also said an "implementation committee" will look into the various constitutional amendments required to implement the concept, and it would then be up to parliament to take a final call. Delivering the Lal Bahadur Shastri Memorial Lecture here, he said that the first four LS and assembly polls were held together till 1967, then how could synchronised polls be dubbed as unconstitutional. Some sections are saying that the idea is unconstitutional, but it is not true as the concept was perceived by the makers of the Constitution, he said, adding that several institutions, including the EC have supported the concept in the past.