KABUL (AFP) - Afghan President Hamid Karzai told visiting US Defence Secretary Robert Gates on Tuesday that Afghanistan would need aid to fund its security forces for up to 20 more years, calling for a long-term US commitment. The newly re-elected Karzai said his new government would work to assume responsibility for Afghanistans security within five years, but the impoverished country lacked the funds to foot the entire bill. Gates, who held talks with Karzai on implementing a new war strategy that involves sending 30,000 extra US troops to fight the Taliban, reiterated that the United States intended to start withdrawing its forces from July 2011. For 15 to 20 years, Afghanistan will not be able to sustain a force of that nature and capability with its own resources, Karzai told a news conference. We hope that the international community and the United States, as our first ally, will help Afghanistan reach the ability to sustain a force, the president said. Karzai, who was sworn in for a new term in office three weeks ago, has postponed the unveiling of his long-awaited cabinet, a parliament spokesman said Tuesday. Re-elected following a controversial August election marred by massive fraud, the head of state is under huge domestic and foreign pressure to form a transparent government to help end an eight-year Taliban insurgency. His spokesman Siamak Herawai had said Karzai intended to introduce a number of his new cabinet members to parliament on Tuesday, but a spokesman for the lower house said the move had been delayed until Saturday at the earliest. They notified the parliament yesterday about the delay. It will not happen until next week, spokesman Haseeb Noori told AFP. The working week in Muslim Afghanistan begins on Saturday. Parliament must pass a vote of confidence before the new Afghan cabinet can start work and analysts hope that the new line-up can finally crack on with the business of government after months of political paralysis. The delay comes after some MPs opposed presentation of the cabinet in groups, preferring the entire line-up to be finalised first. Washington has warned Karzai to fight corruption or see his cabinet bypassed in favour of lower level officials to provide services to Afghans as part of a sweeping new war strategy that includes more than 30,000 extra troops. In a possible sign of a future campaign against graft, an Afghan court on Monday sentenced the mayor of Kabul to four years in prison on corruption charges in the first high-profile corruption conviction since the election. But Karzai faces a challenge in satisfying those who supported him in the elections with government jobs and keeping his Western allies happy. Spiralling insecurity, the drugs trade, corruption, crime and alliances with warlords accused of rights abuses have triggered mounting criticism of his administration, dismaying Western capitals and the Afghan public.