The White House official who provided additional testimony against Nixon, including Alexander Butterfield, was John Dean.
John Dean, who served as White House Counsel to President Nixon, testified before the Senate Watergate Committee and provided crucial information about the Watergate scandal. Dean's testimony played a significant role in implicating Nixon in the cover-up of the break-in at the Democratic National Committee headquarters, ultimately leading to Nixon's resignation.
Dean's testimony revealed the existence of a secret White House tape recording system, which captured conversations implicating Nixon in the Watergate cover-up. This revelation was a turning point in the investigation and significantly damaged Nixon's credibility.
Overall, John Dean's testimony was instrumental in unraveling the Watergate scandal and exposing the extent of the wrongdoing within the Nixon administration.
