The aspect of the investigation into the Monica Lewinsky affair that led directly to an impeachable offense was perjury.
Perjury means lying under oath.
When President Clinton wilfully told an untruth or made the misrepresentation under oath, he committed perjury, which is an impeachable offense.
Thus, the aspect of the investigation into the Monica Lewinsky affair that led directly to an impeachable offense was perjury.
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