 In August 1939, Lindbergh was the first choice of [[Einstein|Albert Einstein]], whom he met years earlier in New York, to deliver the [[Einstein–Szilárd letter]] alerting President Roosevelt about the vast potential of nuclear fission.However, Lindbergh did not respond to Einstein's letter or to [[Leo Szilard|Szilard]]'s later letter of September 13.Two days later, Lindbergh gave a nationwide radio address, in which he called for isolationism and indicated some pro-German sympathies and anti-Semitic insinuations about Jewish ownership of the media, "We must ask who owns and influences the newspaper, the news picture, and the radio station, ...