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CNN anchor Brooke Baldwin was NOT having it when a guest on her show used the n-word while criticizing Donald Trump's appointees, and she abruptly pulled the plug on the interview.

Author Charles Kaiser was ripping Stephen Bannon when he claimed Trump's Chief Strategist uses the racial epithet. Watch the reaction from Brooke and Paris Dennard -- a Trump supporter who's black and shocked as hell at the turn in the conversation.

The buck stopped with Brooke ... real quick.

2:00 PM PT -- Kaiser is apologizing to anyone offended by his use of the n-word, but thinks it's worse that he accused Bannon of using it instead of Jeff Sessions, Trump's potential Attorney General candidate. On Facebook he claims several witnesses will back his allegation.