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Dear Mr. Prins,
Thank you for posting your question to History Hub! If any documentation of the ambassador’s lobbying on behalf of Mr. Norton does exist, it would probably be in the series United States Consular Records for Paris, France , 1801-1940 (assuming that the ambassador he is referring to is the U.S. ambassador to France). I would suggest reaching out to the reference staff in College Park at Archives2reference@nara.gov for more information.
Best of luck with your research!