The US president’s signature piece of legislation promises to cut taxes (again), create new tax exemptions, and muster up billions of dollars for deportation efforts. But it will also reduce social spending and balloon the federal deficit, a sore point for many fiscally conservative Republicans.

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

President Donald Trump has urged Congress to bundle the bill into one package to speed up its passage and prevent legal gridlock.