CNN's Sanjay Gupta is casting doubt Donald TrumpDonald John TrumpJudge rules to not release Russia probe documents over Trump tweets Trump and advisers considering firing FBI director after election: WaPo Obama to campaign for Biden in Florida MORE's health, even asking whether the GOP presidential nominee is at risk of heart disease.

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"I don't even know what to make of this letter," Gupta told CNN's Ashleigh Banfield on Tuesday, referring to a letter from Dr. Harold Bornstein, who examined Trump last December. "Whether you are a doctor or not, that degree of hyperbole and these words being used is very unusual. People don't write like that. 'Strength and stamina are extraordinary.' What does that mean, exactly?"

During Bill ClintonWilliam (Bill) Jefferson Clinton'Democrat-run cities' fuel the economy, keep many red states afloat Late-night hosts targeted Trump over Biden 97 percent of the time in September: study A closing argument: Why voters cannot trust Trump on healthcare MORE's time as president, Gupta served as a healthcare adviser to Hillary ClintonHillary Diane Rodham ClintonJudge rules to not release Russia probe documents over Trump tweets Trump and advisers considering firing FBI director after election: WaPo Obama to campaign for Biden in Florida MORE, Trump's Democratic opponent in the 2016 election.

On Wednesday, the neurosurgeon went even further in questioning Trump's health during an appearance on CNN's morning program, "New Day."

“Here you have a lot of language with not a lot of data to back it up,” he told host Chris Cuomo while analyzing Bornstein's letter. “They say he’s on a statin. What’s his cholesterol? You’ve indicated in some way that he has some these types of medicines he's taking — for what, exactly? Does he have a risk of heart disease?”

Gupta did not voice his concerns on CNN after the Bornstein letter was released by the Trump campaign late last year.  Gupta has turned his focus to Trump, however, after the billionaire and his surrogates have questioned Hillary Clinton's health.

In a related item, a CNN.com story by political reporter Gregory Krieg on Wednesday concludes in a headline that "Clinton's health is fine" and asks "but what about Trump?"

The story characterizes any scrutiny of Clinton's health as "conspiracy theories" while featuring a photo of Trump eating fast food from McDonald's.