"Because of the scurrilous attacks on me and my wife of 42 years, it has been decided by others that I can no longer be as forceful as I need to be in leading the F.B.I. and carrying out my responsibilities to the bureau and the nation," he said. "It is because I believe in the principle of an independent F.B.I. that I have refused to voluntarily resign."

Mr. Clinton said that after reviewing Mr. Sessions's performance, Attorney General Janet Reno had advised him that Mr. Sessions should go. "After a thorough review by the Attorney General of Mr. Sessions's leadership of the F.B.I., she has reported to me in no uncertain terms that he can no longer effectively lead the bureau."

Despite the President's severe tone, he seemed to regret having to force Mr. Sessions from his post. He said he had hoped that the issue could be settled at the Justice Department without the necessity of using his authority to dismiss the Director, who has a 10-year term but may be removed by the President at any time.

But Mr. Sessions's intransigence had festered into an awkward situation for Mr. Clinton.

A Republican stranded in a Democratic Administration, Mr. Sessions was appointed to head the F.B.I. by President Ronald Reagan in 1987 amid the turmoil of the Iran-contra affair. Mr. Sessions arrived as a respected judge from San Antonio, but after five and a half years in office, he leaves with his star fallen, his agency adrift and his support at the F.B.I. all but drained away. Troubled Tenure

He served under four Attorneys General, and each complained privately about his absentee management style, his frequent traveling -- often to unimportant events -- and his inability to take command.