https://thehill.com/homenews/sunday-talk-shows/3721990-rnc-chair-says-committee-cant-pay-trumps-legal-bills-if-he-announces-2024-run/This is of course not surprising, doing so would open up a host of legal issues and of the RNC's by-laws, but it does create an interesting obstacle for Trump. He could theoretically just separately fundraise both for his campaign and legal fees but that's still a drain on campaign funds and for the party at large.
Honestly though the RNC paying Trump's legal fees to begin with is already pretty laughable and contrary to their supposed purpose, as Trump isn't even a Republican office holder now. But not surprising.