Nixon negotiated the return of POWs from Vietnam in exchange for ransom, just like the French did with their own POWs.
Congress decided that wouldn't fly, and so they killed the deal because they didn't want to admit defeat.
They knowingly left thousands of POWs to die in Vietnam that Nixon would have brought home. And they doubled down on it 20 years later when John "Bomb, Bomb, Bomb Iran" McCain (who spent most of his POW time in a mostly nice prison due to his father's Admiral status) led the comitee on POWs and helped burry the case.
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I firmly believe Nixon was the target of a coup by the deep state. He was doing some shit they didn't like, and they removed it. Maybe his real-politik dealing with commies and temporary detente was too much. Maybe he refused to greenlight one too many CIA shitshows. Maybe he wanted to get glowies on a shorter leash. Who the fuck knows. But they removed him.
Watergate was a complete nothingburger when you compare it to other scandals involving presidents like FDR's attempt at court packing and his literal NKVD agent sidekicks, or Iran Contra, or GWB lying about WMDs in Iraq, or LBJ false flagging the Gulf of Tonkin to get the USA in Vietnam. But it was held up as some sort of masterstroke of journalism for decades and absolute win. How many people even fucking know what it actually was and what happened? You think people realize Watergate was Nixon doing one tenth of what Crossfire Hurricane from Obama did to Trump? Nah. It's all a big meme. And the media never forgot the high they got from it, and kept chasing it for 50 years until it caused them to collapse.
Also Spiro Agnew was funny. He got to go to that super party the Shah of Iran threw for the 2500 anniversary of Iran.