James Fitzgerald, a retired FBI profiler and forensic linguist who, in 1996, helped catch "Unabomber" Ted Kaczynski -- who killed 3 people and injured 23 in bombings between 1978 and 1995 -- told Fox News on Wednesday that the letter sent to John Brennan, the former director of the CIA and a staunch Trump critic, reminded him of something the Unabomber would send because of the number of stamps used on the package.