NEW DELHI, Aug 15: Lack of interest among opposition parties has put a question mark on the outcome of efforts of Rashtriya Loktantrik Morcha (RLM) president Mulayam Singh Yadav to bring all ``secular parties'' on a common platform as part of its broader agenda to topple the Vajpayee Government.The Morcha's open invitation to all parties, except the BJP and Samata Party, to attend a meeting here tomorrow has evoked a lukewarm response from major opposition parties including the Congress and CPI(M).Though the meeting had been convened to decide on action against Shiv Sena-BJP Government in Maharashtra on the Srikrishna panel report, it is being viewed as an effort to bring all secular parties together to dethrone the BJP-led coalition at the Centre.Opposition leader in Lok Sabha Sharad Pawar questioned the numerical strength of the fledgling Morcha. ``Where is the arithmetic,'' he asked.CPI(M) on the other hand said it was not aware of any such meeting. Its parliamentary party leader SomnathChatterjee said, ``I have no idea if my party will attend the meeting at all''. Chatterjee, however, expressed concern over the manner in which the Srikrishna report on Mumbai riots had been treated by the Manohar Joshi Government.