American real estate mogul and television personality Donald Trump has sued a New York Times writer for calling him a 'millionaire' instead of a 'billionaire'.

According to an article published by the Daily Telegraph, the business tycoon known for his stubborn personality and unconventional hairstyle, has launched a lawsuit against Timothy L. O'Brien who questioned Trump's net worth in an article published in 2005. Trump claims his reputation and brand were damaged and that he missed out on business opportunities because of the story.

"If someone came in here and said, 'Mr Ceresney, you're worth $150 million to $250 million,' I think I'd feel pretty good," he told the judge. "I wouldn't call that defamation."

Aside from his numerous investments in the real estate industry and his popular television show "The Apprentice", Donald Trump is also the author of the best selling book "Think Like a Billionaire", which analysts say stands to lose some of it's shine if the man called "the Donald" proves to be just a lowly 'millionaire' as O'Brien contends.