A new book claims that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE has no problem stepping outside the rules of golf and calling in the Secret Service to help him cheat.

Sports writer Rick Reilly wrote in his new book "Commander in Cheat: How Golf Explains Trump" that the president often uses his caddy or even Secret Service agents to move his golf balls out of difficult spots when on the course, The Independent reported Thursday.

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"Whether you’re his pharmacist of Tiger Woods, if you’re playing golf with him, he’s going to cheat,” Reilly wrote, adding: "He cheats at the highest level. He cheats when people are watching, and he cheats when they aren’t."

He also inflates his golf handicap, which the president professes to be 2.8, and has falsely claimed to have won more than a dozen club championships.

But that claim is “a lie that’s so over-the-top Crazytown, it loses all credibility among golfers the second it’s out of his mouth," Reilly wrote.

Reilly has previously made claims about Trump's integrity on the golf course, prompting a response from then-candidate Trump in 2016: “I always thought he was a terrible writer. I absolutely killed him, and he wrote very inaccurately.”

But Reilly isn't the only one who has accused Trump of cheating. LPGA Tour golfer Suzann Pettersen told a Norwegian newspaper earlier this year that the president "cheats like hell," adding: "I’m pretty sure he pays his caddie well."