impressionist was sitting behind the Resolute Desk in the Oval Office and even taking calls from foreign leaders, according to the whistleblower. “A birthday party impressionist ended up the leader of the free world, if only for a few minutes here and there,” the actor told investigators.

Dozens of West Wing staffers were fully complicit in the elaborate ruse, with sources saying “the whole building had to be in on it” to keep the deception alive. The scheme allowed ...