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.

U.S. Democratic Representative Mark Pocan plans to introduce a bill designed to ban “special government employees” like Elon Musk from having federal