After his 2016 election, Trump tapped Wall Street raider Carl Icahn as a "regulatory reform" adviser. He soon quit under a cloud of controversy.

Musk has spent days bounding in and out of meetings, sitting in on phone calls, weighing resumes and traveling to Washington as Trump’s unofficial co-president.

Elon Musk — billionaire, Trump whisperer and most powerful civilian ever — is coming to Washington. Why it matters: Musk doesn't play small. So now that he's getting involved in one of the biggest employers on planet Earth,