Elon Musk 's time at the right hand of Donald Trump began with, uh, energetic on-stage appearances during which he performed a very Nazi-like salute and waved around a chain saw. But it ended in far more chastened fashion,

Elon Musk appeared with a mysterious black eye during his final Oval Office press conference with President Donald Trump, which he later attributed to his 5-year-old son, X Æ A-12

Trump's spending bill includes around $4.9 trillion in tax breaks and increases funding for defense and border security, some of which would be paid for by social security cuts. It would also raise the debt ceiling, the limit on how much the federal government can borrow, to $4 trillion.

The clash between President Trump and Elon Musk is a battle between two billionaires with social media power. Here is how they stack up.

President Donald Trump heaped praise on Elon Musk as the tech billionaire prepared to leave his unorthodox White House job