Elon Musk, the tech billionaire and unelected adviser to President Donald Trump, is asserting control over much of the federal bureaucracy and sensitive government computer systems despite lacking clear authority.

The highest-ranking career official at the Treasury Department was pushed out after refusing to hand Musk’s team the keys to the government’s entire payment system and the $6 trillion in payments the system processes annually, including Social Security checks, tax refunds and Medicare benefits. Musk and his team have also seized control at the Office of Personnel Management and the General Services Administration, key institutions that function as the central nervous system of the U.S. government.

“In any other situation, this would be called state capture, and people around the world would be condemning it,” says Democratic strategist Waleed Shahid, who writes in a new blog post that Elon Musk is staging a coup.