The "trailer", the Amazon has put in here is meaningless. Forget this so quickly. The description is completely useless.
The film deals with the primal fear of the Americans: the internal security and the paranoid fear of losing the same by terrorism. One should also be concerned about one thing: this film is from the year 1999. Prior to 2001, the subject was compared to today hardly in the public interest (at least outside the US).
A challenging film of a long lasting effect and with great theatrical performance. If I were to take 15 movies to a deserted island: this would definitely be it.