The rancor between Louis Freeh and former President Bill Clinton, who appointed him director of the F.B.I. in 1993, was laid raw anew today as Mr. Freeh continued his assault on the Clinton administration's handling of terrorism, while a former presidential aide accused Mr. Freeh of an "astonishing string of failures that helped leave America vulnerable to the attacks of Sept. 11, 2001." Mr. Freeh, appearing on NBC-TV's "Meet the Press" to promote a book he has written, repeated his assertion that the Clinton administration had failed to grasp the scope and severity of the threat of terrorism and had...