Elon Musk has at least one more battle to wage against Securities and Exchange Commission Chair Gary Gensler, who will be leaving the agency when President-elect Trump takes over in January. Musk yesterday posted a copy of a letter sent to Gensler by Musk's attorney, Alex Spiro. The letter dated December 12 says the SEC issued a settlement demand in its investigation into whether Musk violated federal securities laws in connection with 2022 purchases of Twitter stock, and that the SEC is investigating Neuralink.