I have looked for the context of this quote, but have only found it in articles where it is used to support the author’s point that Harding was just generally a terrible president.
When did Harding make the remark, “I am not fit for this office and should never have been here”? The fact that he says “This office” and “here” and the fact that he died in office suggest that this statement was made while he was president. But it feels very out of place, especially given the modern standard held by most presidents, where they and their aides would rather be caught dead than undermine the credibility of the president. Why would he say this?