The entrepreneur is working with President Donald Trump to assert White House control over the sprawling federal workforce.

Elon Musk announced that federal employees must justify their work or risk termination, following Trump’s call for budget cuts.

Musk - the world's richest person and Trump's biggest donor - has led the effort to fire swaths of the government workforce.

Elon Musk, acting on President Trump's directive to cut federal government size, asked federal employees to detail their ...