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Sen. Arlen Specter, Pennsylvania Republican and former chairman of the committee, said that Senate Minority Leader Tom Daschle should conduct an inquiry to determine who wrote the memo and whether there were any senators who might have collaborated with it or approved it.

“If any senator is involved in this, it brings into question their competence to serve” on the intelligence committee, Mr. Specter said, alluding to the removal of Sen. Patrick J. Leahy, Vermont Democrat, from the intelligence committee in 1987 over charges that he leaked sensitive information to the press.