Musk is on the attendee list for a call starting now to review Twitter’s “RIF,” or reduction in force plan, according to a screenshot of the calendar event I obtained. David Sacks, a former PayPal executive Musk has tapped as an advisor, is also on the call.

Separately, several Twitter employees tell me they saw a discussion in a Slack channel today saying that the company is planning to cut roughly 3,800 employees, which would be about half the workforce. Employees are expecting to hear more by Friday.

All their work calendars were set to private today.