"He's got perfect genes. He has incredible energy and he's unbelievably healthy," Mnuchin said, during an event organized by the news website Axios.
"This guy has got more stamina than anybody I've ever met. I travel with him all the time. It's unbelievable."
Trump has boasted of his own robust health and today's remarks echoed statements made in 2015 by his personal physician Harold Bornstein, who proclaimed in a letter that Trump would be "the healthiest individual ever" to win the presidency.
Mnuchin said Trump's no longer dines on McDonald's or fried chicken from fast-food chain KFC because cuisine at the White House is "great."
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The official praised Trump for his open-door policy at the Oval Office, making him easily accessible.
"People are coming and going and he thinks about something and calls somebody on the phone," he said. "This is not a formal, scheduled president."
Mnuchin also jokingly said Trump's likeness should appear on a new domination of US currency.
"I think we should look at putting President Trump on the thousand dollar bill.
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