The relationship between Mr. Trump and tech industry power brokers was built on money and the promise of deregulation, with Mr. Musk in the middle of it all.

In the wake of the schism, some Republicans are stuck in the middle debating their next moves. Do they side with Trump, the leader of the party whose influence and authority looms over so many aspects of life?

Musk, formerly seen as one of Trump’s closest allies, ignited the feud with Trump on Tuesday by denouncing his legislation as a “disgusting abomination,” calling it a “massive, outrageous, pork-filled” bill on social media platform X. Now, Republicans are taking sides in the ongoing fight.