I don’t think he can because the RNC already happened making him the party’s nomination. The DNC hasn’t happened yet so the Democrats were able to switch candidates before they meet to nominate.

https://ballotpedia.org/ State laws and party rules on replacing a presidential nominee, 2024

Buying Brands:

-Nuoc Mam Vegetarian

-Nuoc Mam Vegan

-24Vegan

-Tofuna Fysh

-Bep Ong Bui

-Ocean’s Halo

Making Recipes:

-Tasty Thai

-Minimalist Baker

-Epicurious

There also exists a vegan version of fish sauce for any herbivores, vegans, or general fish haters out there.