President Donald Trump backed Elon Musk’s demand that federal employees explain their recent accomplishments by the end of Monday or risk getting fired, even as government agency officials were told that compliance with Musk’s edict was voluntary.

Elon Musk is already being sued over the ultimatum he issued to federal workers over the weekend. The Associated Press reports that the State Democracy Defenders Fund filed a newly amended lawsuit in a federal court in California on behalf of unions,