Opponents of the move, many of whom are Democrats who called for Comey’s ouster long before Trump took office, said the timing of the firing was suspect due to the ongoing investigation into alleged collusion between Trump’s campaign and Russian officials.
The act of a president removing the head of the FBI is extremely unusual, but it has happened before.
The last (and only) president to remove an FBI director:
In 1993, then-President Bill Clinton removed FBI Director William Sessions from office after he refused to step down in the wake of an ethics investigation.
In a July 19, 1993, meeting with reporters, Clinton said he had “hoped very much that this matter could be resolved within the Justice Department.”
According to a report from the U.S. Office of Professional Responsibility, Sessions "participated in a sham arrangement designed to evade income taxes on his government-provided home-to-work transportation … improperly used government funds to install a fence at his residence … repeatedly transported non-official passengers in his official limousine and other FBI vehicles … abused governmental travel for personal purposes … (and) refused to cooperate in, and affirmatively blocked, our investigation."