“Because firing his AG, while he was under serious investigation, worked out so well for Nixon.”
I don’t think he fired John Mitchell. I think he fired Archibald Cox, the Mueller of the day.
You are right and I was wrong:
‘The Saturday Night Massacre was a series of events on the evening of Saturday, October 20, 1973, during the Watergate scandal in the United States. U.S. President Richard Nixon ordered Attorney General Elliot Richardson to fire independent special prosecutor Archibald Cox; Richardson refused and resigned effective immediately. Nixon then ordered Deputy Attorney General William Ruckelshaus to fire Cox; Ruckelshaus refused, and also resigned. Nixon then ordered the third-most-senior official at the Justice Department official Solicitor General Robert Bork, to fire Cox. Bork considered resigning, but did as Nixon asked.’
https://www.bing.com/search?q=DID nixon fire his attorney general%3F&qs=n&form=QBRE&sp=-1&pq=did nixon fire his attorney general%3F&sc=0-0&sk=&cvid=2DD0C80F140A419F884AD3FEDF62C63F&ajf=timeout#qbidx=1