Author Tim O’Brien says he thinks President Trump would like to stay in office for the rest of his life.

“I think he’d like to be president for life, if the world allowed it,” O’Brien, who wrote the book, “TrumpNation: The Art of Being the Donald,” said Sunday on ABC's "This Week." “I could see him running four or five more times.”

“I think he has no intention of going away,” he continued. “Reality, some investigations, the electorate all might intrude, but I don’t think he thinks about it that way."

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O’Brien covered Trump's businesses for over a decade as a New York Times reporter. His book gained notoriety for a passage that read that Trump was not actually a billionaire, and that his net worth was less than $250 million.

Trump responded to those claims by filing a $5 billion lawsuit against O’Brien and his publisher. The lawsuit was dismissed in 2009, according to the Times.

Trump has yet to publicly comment on running for reelection in 2020, but his campaign has filed for a trademark for a 2020 election slogan and Trump has held several campaign rallies since assuming office in January.