Prime Minister Narendra Modi, who has been shredded by the opposition for his remarks on Rajiv Gandhi, today amplified his argument, challenging the Congress to "fight polls in the name of the Bofors-accused former PM". The controversy over the Prime Minister's comment -- that Rajiv Gandhi "ended his life as bhrashtachari (corrupt) number one" -- snowballed yesterday, as various opposition leaders tweeted in protest and Union minister Arun Jaitley defended the Prime Minister.