© Damon Winter/The New York Times Paul Manafort at a campaign event for Donald Trump last June.

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The greatest political scandal in American history was not Aaron Burr’s shooting of Alexander Hamilton, and perhaps wasn’t even Watergate. Rather it may have been Richard Nixon’s secret efforts in 1968 to sabotage a U.S. diplomatic effort to end the Vietnam War.
Nixon’s initiative, long rumored but confirmed only a few months ago, was meant to improve his election chances that year. After Nixon won, the war dragged on and cost thousands of additional American and Vietnamese lives; it’s hard to see his behavior as anything but treason.
Now the F.B.I. confirms that we have had an investigation underway for eight months into whether another presidential campaign colluded with a foreign power so as to win an election. To me, that, too, would amount to treason.