Britain’s Prime Minister Gordon Brown is rallying his political allies in a desperate attempt to shore up his government after a third senior minister announced his resignation. With the ruling Labour party expecting a poor showing in local and European elections, Brown’s future looks increasingly precarious.James Purnell, the UK’s works and pensions secretary made a direct attack on his boss’s authority in his resignation letter printed in several daily newspapers. His decision to quit came within hours of the polls closing in elections likely to reflect voter disgust at reports that some MPs have abused their parliamentary allowances. Although none of the political parties has been left unscathed, Conservative leader, David Cameron is widely seen as to have emerged more decisive and accuses the government of falling apart. Liberal Democrat leader Nick Clegg has joined Cameron’s call for an immediate general election. With back benchers collecting names urging Brown to go and with five politicians having quit Brown’s government within the last week, the beleaguered prime minister is expected to announce an immediate cabinet reshuffle in a bid to save his political career.