The federal government has written a letter to Chief Justice of Pakistan asking him to nominate a Supreme Court judge to head the probe body to investigate US raid which killed al Qaida chief, report said. The letter, which has been handed over to the Supreme Court Registrar by the law secretary on Sunday, requests the Chief Justice to appoint a judge of its own choice. The government had earlier constituted a five members commission headed by SC Judge Justice Javed Iqbal in the light of the joint resolution passed in the incamera session of the parliament to probe the Abbottabad incident.