CNN medical correspondent Sanjay Gupta admitted on Tuesday he didn’t know what to make of a letter Donald Trump’s physician released last year expounding the Republican presidential candidate’s health in bombastic terms.

“Whether you’re a doctor or not, that degree of hyperbole and these types of words being used is very unusual,” Gupta told colleague Ashleigh Banfield. “People don’t write like that, that this is ‘the healthiest ever.’ First of all, they couldn’t substantiate [that]. How do you know that someone is the healthiest ever?”

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The letter from Jacob Bornstein, released last year, promised that Trump would be the “healthiest ever” president-elect if he defeated Democrat Hillary Clinton in November. It has come under more scrutiny after Trump supporters began arguing that Clinton’s health is in question.

Gupta also poked fun at the letter for saying that Trump only got “positive” results on his medical exams.

“It’s funny in medicine, because when something is good we say it’s a negative result. Meaning, that it did not appear when we did an exam. Positive results actually means quite the opposite,” Gupta explained. “Calling things ‘test scores’ instead of results — his PSA ‘test score’ was this, as if it was the SAT exam instead of a blood test. It’s a strange letter that’s absurd to look at it on face value.”

Watch the discussion, as aired on Tuesday, here.