“X” Envelope, June 26, 1973
When he left the White House, Johnson instructed his National Security Adviser Walt Rostow to take the files related to Nixon’s interference with the peace talks. In 1973 Rostow gave them to the Johnson Library with instructions not to open them for 50 years. However, they were opened in 1994, and most of the documents have since been declassified. In addition to cables, the files also contained memos from sources with knowledge of Nixon’s plans and secret National Security Agency reports on President Thieu’s conversations regarding his monitoring of the election and decision to refuse negotiations until Nixon took office. Johnson never went public with Nixon’s meddling, believing it would have thrown the country into turmoil., National Archives, Lyndon B. Johnson Presidential Library and Museum
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