India News: New Delhi: Congress today dismissed Narendra Modi's attack on Prime Minister Manmohan Singh reminding him that the country has over two-and-a-half a dozen Chief Ministers and rejected as "tall talk" his challenge to Singh for a public debate on pressing issues. br br Gulam Navi Azad referred to a Hindi proverb to reject any comparison between the Prime Minister and Modi, wondering, "How can any CM give a challenge to PM. Where is the comparison between Raja Bhoj and Gangu..." He added, "Who has stopped anybody from giving a challenge. Sitting in one's home everyone is a tiger..." Ambika Soni also dismissed Narendra Modi's attack on Prime Minister Manmohan Singh .