Watergate

“The first public statement of a defense was made by Nixon on June 22, 1972—that nobody in his White House was involved in this bizarre incident—and Nixon’s final firewall explanation of his defense was issued eleven months later, on May 22, 1973; the latter followed the firing of his top aides, including your author, who had become the centerpiece of his defense.”

“The Nixon Defense: What He Knew and When He Knew It” by John W. Dean

For those interested in researching and understanding more about Watergate from the original recordings-

http://nixon.archives.gov/virtuallibrary/tapeexcerpts/index.php

http://web2.millercenter.org/rmn/audiovisual/whrecordings/