5:03 a.m. ET On Friday afternoon, the world’s richest person showed up at what sounds like one of the world’s most boring agencies to demand a list. Elon Musk had arrived at the Office of Personnel Management, a mundane-sounding agency with vast power overseeing the federal civilian work force. During President Trump’s first term, the nation’s leader used the agency to enforce loyalty to his agenda. During his second term, it appears Mr. Musk may try to use the office to enforce loyalty to his own agenda. Mr. Musk has stormed into Washington with a host of friends and paid employees, determined to leave his imprint quickly. Never before in modern times has someone so rich played such a hands-on role in American government, with Mr. Musk making himself omnipresent in Washington since flying there for Mr. Trump’s inauguration. His plane has not left. He is both a celebrity and a bureaucrat, sometimes simultaneously. At one moment, he and several of his billionaire friends, including the investor Antonio Gracias, were mingling with fixtures of the Washington establishment at the annual dinner of the Alfalfa Club, where several attendees broke the event’s unwritten no-phones policy and mobbed him for selfies. At another, he was spotted in the White House mess, where 20-something staff members grab sandwiches between meetings — but unlike Mr. Musk, most do not return to a West Wing office to help oversee what Mr. Trump says is a 40-person team carrying out his executive orders. Mr. Musk has taken to Washington with his trademark single-mindedness and bravado. He is reprising the tactics he deployed at Twitter, which he bought in 2022: He has brought to bear the full weight of his Silicon Valley network, installing some of the same executives who cut 80 percent of the social network’s staff, and even using the same email subject lines. He has promised “mass head-count reductions across the federal bureaucracy,” and is now racing to do just that. On Mr. Trump’s first day, he empowered Mr. Musk by establishing the so-called Department of Government Efficiency, a cost-cutting effort that Mr. Musk is leading. Mr. Trump gave the group the authority to work on a plan to reduce the size of the federal work force, among other things. We are having trouble retrieving the article content. Please enable JavaScript in your browser settings. Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times. Thank you for your patience while we verify access.