WASHINGTON (AP) _ A longtime critic of the Central Intelligence Agency is suing former first lady Barbara Bush over statements in her 1994 autobiography that he said are ``false and defamatory.''

Former CIA operative Philip Agee said Mrs. Bush falsely wrote in ``A Memoir'' that Agee's identification in his 1975 book of the CIA's Athens station chief led to the assassination of the official, Richard Welch.

At a news conference Wednesday, Agee denied writing about Welch before he was assassinated in December 1975, mentioning him by name to anyone or even knowing him while both men worked for the CIA.

Mrs. Bush and publishers Macmillan Inc. and Simon & Schuster Inc. are named as defendants in the lawsuit filed Tuesday in Superior Court for the District of Columbia. It seeks $4 million in damages and full retractions from both Mrs. Bush and Macmillan, a division of Simon & Schuster.

Jim McGrath, a spokesman for former President Bush and his wife, who now live in Houston, said he had not seen the lawsuit and declined comment. Bush is a former director of the CIA.

Simon & Schuster spokesman Andrew Giangola declined comment Wednesday. He said the company had not received a copy of the lawsuit.