Here's what to know about the feud between Donald Trump and Elon Musk over the president's "Big Beautiful Bill."

President Donald Trump and billionaire Elon Musk’s alliance ended dramatically this week as the two publicly feuded on social media over Republican lawmakers’ One Big Beautiful Bill Act, which would advance the president’s agenda.

House Speaker Mike Johnson (R-La.) said Sunday that Elon Musk's online blowup against President Trump and his signature big, beautiful bill was disappointing but brushed off questions about the impact of the billionaire's criticism.