Officials at the FBI and State Department sent their staff emails telling them not to respond outside their chains of command, in a possible sign of tension between the president's allies and Elon Musk.

Millions of federal employees are heading into their workweek caught between differing factions of the Trump administration.

Elon Musk's claim that federal workers who ignore a mass email will lose their job isn't supported by the email's request — or OPM guidance that says responses to its mass emails are "voluntary."