This is the reason the Trump family wants to take over the RNC:
https://www.bloomberg.com/news/articles/2024-02-21/trump-spent-more-than-donors-gave-while-pac-spent-on-legal-fees
The legal costs, which are expected to grow as Trump faces four criminal indictments, are likely to be a drag on his reelection effort’s finances.
Money that can be used for legal fees is set to run out mid-year if he keeps spending at the same pace he did in 2023, meaning he will need to raise more from donors or appeal to the Republican National Committee for help.