Prime Minister Manmohan Singh on Friday firmly rejected allegations that MPs were bribed to win the 2008 trust vote and said the US diplomatic cables put out by WikiLeaks were "speculative, unverified and unverifiable".

"The government rejects the allegation firmly. Nobody from the Congress or the government was involved in illegal act," Manmohan Singh told the Lok Sabha, a day after the opposition vociferously demanded his resignation over the alleged 2008 cash-for-votes scam that resurfaced with a newspaper publishing the WikiLeaks cables.