Elon Musk tweeted Saturday that federal workers would soon get an email “requesting to understand what they got done last week.” According to the New York Times, the email from the Office of Personnel Management went to agencies across the federal government that afternoon, including the FBI, State Department, and others, with a deadline for response by 11:59PM ET on Monday.

However, the message lacked a detail from Musk’s tweet, according to the Times, where he said, “Failure to respond will be taken as a resignation,” which a number of lawyers have said would be illegal. The Washington Post reports that experts said it “may be asking some recipients to violate federal laws,” and Sam Bagenstos, a University of Michigan law professor quoted by the Times, said, “There is zero basis in the civil service system for this.”

House minority leader Hakeem Jeffries said in a statement Sunday that “Elon Musk is traumatizing hardworking federal employees, their children and families. He has no legal authority to make his latest demands.”

The stunt is another echo of Musk’s approach after he took over Twitter, with requests to review engineer’s code and saying that failing to respond to an email would be regarded as a resignation. Across hundreds of tweets posted on Saturday and early Sunday, Musk — who may or may not run the “Department of Government Efficiency” (DOGE), in addition to his various companies — claimed, without presenting evidence, to be rooting out fraud and employees who don’t do any work.

Leaders of at least some of the departments, like the FBI and State Department, reportedly told their workers to await guidance to respond, while the Post reports that acting Cybersecurity and Infrastructure Security Agency director Bridget Bean told staff to comply with the “valid request.”

Unions like the American Federation of Government Employees and the National Treasury Employees Union told employees “not to respond, either just yet or at all,” Axios writes. CNN reporter Pete Muntean said the National Air Traffic Controllers Association called the “email an unnecessary distraction to a fragile system.”