"Where Nixon went wrong was not in his use of secrecy to conduct foreign policy—diplomacy had always required that—but in failing to distinguish between actions he could have justified if exposed and those he could never have justified. Americans excused the lies Eisenhower and Kennedy told because the operations they covered up turned out to be defensible when uncovered. So too did the methods by which Nixon brought about the China opening, the SALT agreement, and the Vietnam cease-fire: the results, in those instances, made reliance on secrecy, even deception, seem reasonable. But what about the secret bombing of a sovereign state? Or the attempted overthrow of a democratically elected government? Or the bugging of American citizens without legal authorization? Or burglaries carried out with presidential authorization? Or the organization of a conspiracy, inside the White House itself, to hide what had happened? Nixon allowed all of this during his first term; his reliance on secrecy became so compulsive that he employed that tactic in situations for which there could never be a plausible justification. So when plausible denial was no longer possible—in large part because Nixon, with his secret Oval Office taping system, had even bugged himself—a constitutional crisis became unavoidable."