Ethics laws make it a federal criminal offense to take actions that benefit family businesses — even for so-called special government employees, unless a waiver is issued.

Elon Musk is testing the limits of legal and ethical restrictions on the role of special advisers in U.S. presidential administrations, according to some legal experts and lawmakers who oppose the billionaire's mission against what he deems wasteful government spending.

Elon Musk and his allies are harnessing tech units and other agencies that handle daily federal operations to amass sweeping control of the executive branch.

Tesla CEO, SpaceX founder and the richest billionaire in the world Elon Musk is now a U.S. government employee. What to know about his citizenship.