North Vietnam insisted for three years that the agreement could not be reached unless the United States agreed to remove South Vietnamese President Nguyen Vén Thiu from power and replace him with someone more acceptable to Hanoi. Nixon and Kissinger were not prepared to sign an agreement to overthrow a government that had not overthrew the NLF by force of arms, although the scale of North Vietnam`s claims is controversial. Historian Marilyn B. Young argues that the content of Hanois` proposal was systematically distorted by his initial plea for Thiu`s assimilation to what Kissinger advocated as a demand for his downfall.  At the time of the peace agreement, the United States agreed to replace the equipment in succession. But the United States has not given its word. Is the word of an American reliable these days? The United States has not kept its promise to help us fight for freedom, and in the same struggle the United States has lost 50,000 of its young men.  Nixon asked the eminent Asian-American politician Anna Chennault to be his “channel to Mr. Thieu”; Chennault agreed and regularly reported to John Mitchell that Thieu had no intention of attending a peace conference.
On November 2, Chennault told the South Vietnamese ambassador: “I just heard from my boss in Albuquerque, who says his boss [Nixon] is going to win. And you`ll tell your boss [Thieu] to hold on for a while longer.  Johnson learned about the NSA and was furious that Nixon had “blood on his hands” and that Senate Minority Leader Everett Dirksen agreed with Johnson that such an action was a “betrayal.”    Defence Minister Clark Clifford considered this to be an unlawful violation of the Logan Act.  In response, President Johnson ordered the listening of members of the Nixon campaign.   Dallek wrote that Nixon`s efforts “probably made no difference” because Thieu was unwilling to participate in the talks and there was little chance of reaching an agreement before the elections; However, his use of the information provided by Harlow and Kissinger was morally questionable and Vice President Hubert Humphrey`s decision not to make Nixon`s actions public is “an unusual act of political decency.”  The last major breakthrough was on October 8, 1972. Earlier, North Vietnam had been disappointed by the results of its Nguyen Hue offensive (known as the Easter Offensive in the West) that led the United States to retaliate with Operation Linebacker, a major campaign of airstrikes that blunted the North`s engine in the South and damaged the north. They also feared increasing isolation if Nixon`s efforts to détente significantly improve U.S. relations with the major communist powers, the Soviet Union and the People`s Republic of China, which supported North Vietnamese military efforts.