Pakistani opposition groups are calling for President Asif Ali Zardari to step down from office following a court ruling striking down an amnesty decree protecting him and other senior officials from facing charges of corruption.<br/><br/>The Supreme Court ruled Wednesday that the National Reconciliation Ordinance, which grants amnesty to some 8,000 senior politicians, bureaucrats and businessmen, conflicts with Pakistan's constitution.<br/><br/>The ruling opens the door for the reopening of all corruption and criminal cases pending against the president's close aides and political allies.<br/><br/>Mr. Zardari is immune from prosecution while in office. However his opponents plan to challenge his eligibility to hold the post. Members of the opposition Pakistan Muslim League-Nawaz party have called on him to resign on moral grounds.<br/><br/>Former President Pervez Musharraf introduced the amnesty in the 2007 National Reconciliation Ordinance.<br/><br/>