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Top rated books on Reddit for subreddit The_Donald (Donald Trump supporters forum) rank no. 52
MSNBC news panel shocked to learn Trump predicted 9/11 in Jan 2000, over 19 months before the attack(r/The_Donald)
The Clancy book was based on a thesis from an Army War College graduate who was assigned to envision a scenario which could cripple the United States with minimal military force.
The author of the thesis was Daniel J. Hill, a lifelong friend of one of 9/11’s biggest heros, Cyril Richard Rescorla.
Read Mr. Rescorla’s biography, Heart of a Soldier. In it, James B. Stewart, the author, interviews Hill and Hill recounts this. He wrote it in the mid-80s I believe.