In January, Driscoll was appointed acting director while Kash Patel's nomination was pending after the departure of Christopher Wray.

Two sources told NBC News that Brian Driscoll, who served as acting director at the beginning of Trump's term, was fired without explanation.

The FBI is firing another round of employees, including former Acting Director Brian Driscoll, in its latest moves against officials who worked on issues that drew President Donald Trump's ire, four people briefed on the matter said on Thursday.