The staggering and exceedingly public rupture in the world’s most consequential and unprecedented partnership was a long time coming. But the surreal state of suspended animation that consumed Washington as President Donald Trump and Elon Musk traded escalating blows on social media obscured a 48-hour period that illustrated profoundly high-stakes moment for the White House.

The bill faces strong headwinds among senators across the Republican spectrum, including fiscal conservatives who say it authorizes unsustainable spending.

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