@StevenSavage I think it was Elon and Tucker promising* him a a sh*tload of money if he made Vance his running mate.
https://www.businessinsider.com/donald-trump-jd-vance-elon-musk-tucker-carlson-david-sacks-2024-7
*A promise it appear Elon is weaseling out of.
https://thehill.com/homenews/campaign/4789349-musk-says-hes-not-donating-45-million-a-month-to-trump/