Watergate Hearings: Senate Select Committee on Presidential Campaign Activities July 30, 1973 - Testimony of John Ehrlichman United States Senate Caucus Room, Washington DC Former Nixon advisor John Ehrlichman testifies to the Senate Select Committee on Presidential Campaign Activities. Erlichman's counsel is John J. Wilson. John Ehrlichman concludes his testimony, reads statement. Haldeman & Ehrlichman attorney John Wilson causes a fuss when suggestion is made by Senator Lowell Weicker that there is a "conflict of interest" in Mr. Wilson representing both men.