The Communist Party of India (Marxist) has demanded the Centre should spell out its views on joint collaboration between the Trinamool Congress and the outlawed Maoists in West Bengal.Briefing newsmen about the ongoing discussions at the Extended Central Committee meeting of the CPM in Vijayawada, the party general secretary Prakash Karat said, though the Trinamool Congress claimed it is a non-political rally, its joint collaboration with the Maoists has been clearly exposed. Referring to West Bengal, he said, Trinamool is the main target for CPM. Congress is only a junior partner in the alliance and not the main force.