Nixon aide John Ehrlichman passes on the president’s recommendations to the heads of the “Plumbers,” Egil Krogh and David Young (see July 20, 1971), regarding “Pentagon Papers” leaker Daniel Ellsberg (see Late June-July 1971): “Tell Keogh he should do whatever he considers necessary to get to the bottom of this matter—to learn what Ellsberg’s motives and potential further harmful action might be.” Within days, Keogh and Young will give Ehrlichman a memo detailing the results of investigations into Ellsberg and a dozen of Ellsberg’s friends, family members, and colleagues. The memo also says that the CIA’s psychological profile of Ellsberg is “superficial.” Keogh and Young recommend a covert operation be undertaken to examine the medical files held by Ellsberg’s psychiatrist, Dr. Lewis Fielding (see September 9, 1971). Ehrlichman approves the idea, with the caveat, “If done under your assurance that it is not traceable.” They also suggest that MI5 (British intelligence) wiretaps on Soviet KGB personnel in England in 1952 and 1953, the years when Ellsberg attended Cambridge University, be examined for any mention of Ellsberg. Ehrlichman approves this also. [Reeves, 2001, pp. 352-353]