Employees at NASA’s Johnson Space Center received a cryptic email Saturday afternoon with the subject line: What did you do last week? The message, from the Office of Personnel Management, instructed employees to respond “with approx.

Elon Musk caused alarm among federal employees and drew ire over an email sent on Saturday requesting that employees summarize their work for the week, and warning on social media that a failure to do so would be taken as a resignation.

Billionaire Elon Musk, who is leading Trump’s Department of Government Efficiency scouring government agencies for suspected waste, delivered a warning Monday to workers on his platform X. “Starting this week, those who still fail to return to office will be placed on administrative leave,” Musk wrote.