The Supreme Court of Pakistan Thursday termed unsatisfactory to the letter written by National Accountability Bureau (NAB) to Swiss authorities for reopening a money-laundering case against President Asif Ali Zardari, a private TV reported. The objections followed a statement by the Swiss Prosecutor General that cases in Switzerland against President Asif Ali Zardari could not be opened as he enjoyed immunity as head of state. A six-member larger bench of the Supreme Court, headed by Chief Justice Iftikhar Muhammad Chaudhry while hearing a case regarding implementation of SC verdict on annulled National Reconciliation Ordinance (NRO), described the NAB letter as inadequate for reopening the case. He observed the letter has no legality as it has not been written by the government itself but the NAB authorities, adding that the ministry of Law should write the letter with the approval of Prime Minster. The SC on the occasion gave deadline to NAB officials and the Attorney General till 1 pm to get the approval of Prime Minister for sending such letter to Swiss authorities. The apex court has stepped up its pressure on the government in recent days, threatening the head of the anti-corruption agency with prison if he didn't reopen all the cases, including one against Zardari in Switzerland. The government have succumbed to court pressure and sent a letter to Swiss authorities asking they reopen the case.