Pakistan's main opposition has urged President Asif Zardari to resign after the Supreme Court declared an amnesty against corruption charges illegal. <br/><br/>The spokesman for the opposition Pakistan Muslim League-N (PML-N) Siddiqul Farooq said Mr Zardari should resign on moral grounds. Another senior PML-N leader, Khawaja Asif, said Mr Zardari should resign in his own interest and that of his party. Meanwhile the presidential spokesman Farhatullah Babar told reporters that the ruling Pakistan People's Party would respect the judgement. However, Mr Babar stressed that the president was protected from prosecution. <br/><br/>He said no criminal proceedings whatsoever shall be constituted or continued in any court against the president during the tenure of office. The Supreme court's move opens the way to possible prosecution for Mr Zardari's political allies, although he is still protected by presidential immunity. The Court has called for all the cases to be re-opened, with hundreds of senior politicians and civilian bureaucrats now facing criminal and corruption charges. <br/>