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Senate Select committee on Presidential Campaign Activities interview with Alexander Butterfield, July 13, 1973
Alexander Butterfield, a former Nixon aide, revealed the existence of a secret White House taping system in an interview with the Ervin Committee. Given a copy of the interview notes, Butterfield added handwritten comments disputing or clarifying certain points. A few days later, the Ervin Committee called Butterfield to testify and questioned him about the tapes.
Butterfield then stated, “There is tape in the Oval Office. This tape is maintained by the Secret Service…”
Records of the U.S. Senate, National Archives and Records Administration, Washington, D.C.