Elon Musk has shared his own disbelief that the government efficiency department Donald Trump tapped him to lead “is real.” The world’s richest man and SpaceX owner, who holds billions of dollars in government contracts through his companies, appeared to mock the newly-created Department of Government Efficiency (DOGE) in a post on X.

Trump made the announcement on social media, fulfilling a campaign promise to give Musk sweeping oversight of federal spending.

Musk—the CEO of Tesla and SpaceX, and owner of X (formerly Twitter)—was quoted in Trump's announcement as saying that DOGE "will send shockwaves through the system, and anyone involved in Government waste, which is a lot of people!"

Donald Trump said that he has tapped Elon Musk, working along with Vivek Ramaswamy, to lead what he calls the Department of Government Efficiency — or DOGE, a nod to cryptocurrency. Musk and Ramaswamy will be tasked with setting the stage for a dismantling of the government bureaucracy,

The Tesla CEO spoke about the hazily proposed "Department of Government Efficiency" on his social media platform, X.