Rice Defends Comments on Iraq Nuke Threat WASHINGTON - National security adviser Condoleezza Rice on Sunday defended her characterization of Saddam Hussein's nuclear capabilities in the months before the Iraq invasion, even as a published report said government experts had cast doubt at the time.    In the run-up to the March 2003 war, Rice said in a television interview in 2002 that the Iraqi president was trying to obtain high-strength aluminum tubes to rebuild his nuclear weapons program...