Radio host Howard Stern, who often hosted President TrumpDonald John TrumpNew Bob Woodward book will include details of 25 personal letters between Trump and Kim Jong Un On The Money: Pelosi, Mnuchin talk but make no progress on ending stalemate | Trump grabs 'third rail' of politics with payroll tax pause | Trump uses racist tropes to pitch fair housing repeal to 'suburban housewife' Biden commemorates anniversary of Charlottesville 'Unite the Right' rally: 'We are in a battle for the soul of our nation' MORE on his show before the reality star and real estate mogul entered politics, claims Trump’s 2016 campaign was a “publicity stunt” to get NBC to give him a raise for “The Apprentice.”

“This is a publicity stunt,” Stern said in an interview with CNN’s Anderson Cooper. “I have no doubt because I have some inside information.”

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Stern said it all started with the 1987 book “The Art of the Deal,” ghostwritten by Tony Schwartz but credited to Trump. Stern said that a public relations professional suggested Trump start a "rumor" that he was planning to launch a White House bid.

“So, all of a sudden, he was being interviewed — the book goes right to No. 1,” Stern said.

Stern said that when Trump’s second book came out, “that’s when he started the rumor that he was running for president.”

“‘The Apprentice’ ratings were not what they were, NBC was not going to give him a raise," Stern said.

“And what’s a better way to get NBC’s interest? I’ll run for president and I’ll get lots of press. And I think that’s what happened.”

Stern added that he doesn’t think Trump likes being president “at all.”

“I think he liked winning the presidency,” he told Cooper. “He likes to win.”