It much be one of those inevitable (and possibly bad) habits that people appear to fall into once they've spent a lot of time looking at the BBC critically: Not trusting BBC News to accurately report simple facts.
Thus, on reading one of the latest Trump-bating pieces on the BBC News website, Echoes of Watergate resurface as Trump-Russia links probed, I thought I'd better Google around after the piece ended:
Fact-checking reveals that this "belief" is wrong. Harry S. Truman dismissed his attorney general, J. Howard McGrath, in 1952 for refusing to cooperate with his own department's corruption investigation.