The Department of Defense is among several U.S. federal agencies pushing back against the email, which was sent out Saturday.

The new Pentagon chief got a look at Guantánamo Bay’s most infamous inmate in his recent visit to the wartime prison.

The email Elon Musk directed to be sent to all federal employees is getting pushback from President Donald Trump's appointed agency heads, notably including the Department of Defense, which posted a statement on Musk's own social media platform instructing its employees to ignore the email for now.

Secretary of Defense Pete Hegseth posted a picture to X of what appears to be a tax notice showing he owes more than $33,000 in taxes.

Secretary of Defense Pete Hegseth said Elon Musk was "welcome" to the Pentagon. How will he approach its deep budget problems?

Defense Secretary Pete Hegseth verified that staffers from Elon Musk’s Department of Government Efficiency are working in the Pentagon to uncover waste, fraud and abuse in the government’s largest discretionary budget.

Hegseth, 44, demanded a proposal that would include annual 8% cuts to the Pentagon’s roughly $850 billion budget, according to a memo.

Since late January, Pete Marocco, a State Department political appointee who was a divisive figure in the first Trump administration, has overseen the dismantling of the aid agency, working alongside Elon Musk, the tech billionaire adviser to President Trump who has posted dark conspiracy theories about U.S.A.I.D.

Secretary of Defense Pete Hegseth on Monday accused the Biden administration ... Security information,” a reference to efforts by Elon Musk’s DOGE team to access taxpayer data.

The Pentagon has temporarily paused a plan that could have resulted in the layoffs of more than 50,000 civilian employees.