The Central Intelligence Agency was told by relatives of Iraqi scientists before the war that Baghdad's programs to develop unconventional weapons had been abandoned, but the C.I.A. failed to give that information to President Bush, even as he publicly warned of the threat posed by Saddam Hussein's illicit weapons, according to government officials. The existence of a secret prewar C.I.A. operation to debrief relatives of Iraqi scientists — and the agency's failure to give their statements to the president and other policymakers — has been uncovered by the Senate Select Committee on Intelligence. The panel has been investigating the government's...