In a mass email sent to federal employees just before 8:30 p.m. — almost exactly 24 hours after an air crash in Washington that killed 67 people — the Office of Personnel Management encouraged F.A.A.

A handful of senior F.B.I. employees have been told to resign within days or be fired, according to people familiar with the discussions. The step came as Kash Patel, President Trump’s nominee to lead ...