Never say Donald Trump isn't a man of his word -- we're told the Miss USA owner is going forward with legal action against ex-Miss Pennsylvania Sheena Monnin ... for saying the pageant is fixed.
TMZ broke the story ... Donald issued a 24-hour ultimatum yesterday -- apologize and retract her statements that the Miss USA pageant predetermines its winners ... or face a lawsuit.
Well, Sheena didn't retract squat -- and now our sources say Donald's lawyers are meeting to draft a defamation lawsuit.
It's unclear when the suit will be filed.
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