West Palm Beach, Florida (CNN) The author of a decades-old biography critical of Donald Trump says the President-elect asked him to leave a Trump-owned Florida golf course Friday, alleging his presence was "inappropriate."

Harry Hurt III, who penned "Lost Tycoon: The Many Lives of Donald J. Trump," says he was preparing for a round at the Trump International Golf Club in West Palm Beach late last week and introduced himself to the billionaire Republican, who was on a practice range.

In an interview on CNN's "New Day," Hurt said he had seen Trump while playing the course about a year and a half earlier -- and that Trump had joked about Hurt's knickers.

He said in 2007 or 2008, Trump clipped his review of nearby Emerald Dunes and hand-wrote a note to Hurt saying the Trump International course "was much better. You should come play." That, he said, led him to believe Trump had no hurt feelings resulting from the 23-year-old book.

Hurt said he approached Trump on the golf course Friday "out of courtesy" as Hurt's foursome -- including Republican mega-donor David Koch -- got set to start its round. He said he's not sure what changed Friday.

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