Nothing rankled Trump more than O’Brien’s estimate that he was worth no more than $250 million, and possibly as little as $150 million, just a year after Trump had published his own book titled Think Like a Billionaire. Insisting O’Brien was wrong, Trump in January 2006 filed a $5-billion libel lawsuit against both the author and his publisher, Warner Books, claiming the author had knowingly made false and malicious statements about a variety of topics, including his net worth.
