Multiple Republican lawmakers appeared split as the feud between President Donald Trump and Elon Musk, one of the president’s biggest allies, escalated into an all-out social media war on Thursday.

At the heart of the breakup is their disagreement over Trump’s “big, beautiful bill,” which Musk has called a “disgusting abomination.” Trump has maintained that his plan is “one of the Greatest Bills ever presented to Congress,” adding that Musk “should have” turned on him “months ago.”