KABUL: The Afghan government could fall within weeks if NATO pulled out troops now, the UK foreign secretary David Miliband warned yesterday as he urged British opponents of the war to give the fight to rebuild the country more time. In an interview with the Guardian at the end of a visit to Kabul for the presidential inauguration of Hamid Karzai, Miliband said, “If international forces leave, you can choose a time - five minutes, 24 hours or seven days - but the insurgent forces will overrun those forces that are prepared to put up resistance and we would be back to square one.” At the end of a day spent visiting British troops and officials at the headquarters of the international military effort, Miliband said Afghans were “sad that they need anyone, but they are passionate that my goodness they do - because if we weren’t here their country would be rolled over”. He agreed that public anxiety about the war is growing in Britain as a result of rising casualties. “Afghanistan wasn’t on the front pages until the last six months for obvious reasons,” he said. “Now for tragic reasons there is a lot of interest. What we have to do is explain to people that the costs of staying are real but they are less than the costs of leaving.” He called for the three main party leaders in the UK to remain united in support of the war, despite growing unease, in particular from Nick Clegg, the Liberal Democrat leader. “Nick Clegg and David Cameron (leader of the UK Conservatives) ask serious questions about different aspects of the campaign. They can do that, and they should be asked,” Miliband said. But he challenged opponents of the war to show that retreat would not harm both Afghanistan and Britain . “I don’t think British opinion is about to flip to a position that says withdraw now,” he said. “But there is a high degree of concern about the casualties, understandably, there is a high degree of concern about the complexity of effecting a strategy in a country with history as complex as this, and there is a high degree of concern about all the partners that we have got. “There is a natural reaction to 18, 19, 20-year-olds, your neighbours, relatives and your friends being killed. It makes you ask, why are we there, can you succeed, is it worth it?” Concerns about Karzai’s failure to combat bribery and extortion in Afghanistan led Gordon Brown to warn earlier this month that he would not put UK troops “in harm’s way for a government that does not stand up against corruption”. After meeting Karzai yesterday Miliband said the Afghan president had asked him “to convey to the British people his gratitude for the sacrifices being made by British soldiers in defending his country.”