Adding to woes of President Asif Ali Zardari, Pakistan's Supreme Court is expected to take up next week legal challenges to the amnesty granted to him and thousands of other people in graft cases under a controversial law which lapsed three days back.<br/><br/>Chief Justice Iftikhar Chaudhry is likely to constitute a special bench of the apex court next week to decide the fate of the people granted amnesty under the National Reconciliation Ordinance (NRO).<br/><br/>The NRO, which expired on November 28, was issued by former military ruler Pervez Musharraf two years ago to scrap corruption cases filed against Zardari, his slain wife former premier Benazir Bhutto and other politicians and bureaucrats between 1986 and 1999. <br/><br/>The NRO lapsed last week after the PPP-led government failed to get it ratified by Parliament in line with an order issued by the Supreme Court. <br/><br/>