Musk's rapid takeover of US government agencies has enabled the businessman to exert unprecedented control over America's federal workforce.

Activists, who have been urging a stronger response, waved signs that said “Nobody Elected Elon,” as the party directs its outrage at Trump’s billionaire ally.

One of the largest U.S. labor unions asked a federal judge on Wednesday to block Elon Musk's government cost-cutting effort from accessing the Department of Labor's systems, which the union warned could give the billionaire sensitive information about investigations into his companies.