CNN's Sanjay Gupta is casting doubt Donald TrumpDonald John TrumpIG investigating Comey memos over classified information: report Overnight Defense: Congress poised for busy week on nominations, defense bill | Trump to deliver Naval Academy commencement speech | Trump administration appeals decision to block suspected combatant's transfer Top Pruitt aid requested backdate to resignation letter: report 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 ClintonWith Ryan out, let’s blow up the process for selecting the next Speaker When Barbara Bush praised Bill Clinton, and Clinton praised the man she loved Meet the Democratic sleeper candidate gunning for Senate in Nebraska MORE's time as president, Gupta served as a healthcare adviser to Hillary ClintonHillary Diane Rodham ClintonPaltry wage gains, rising deficits two key tax reform concerns Trump pressed Sessions to fire FBI agents who sent anti-Trump texts: report DNC sues Russia, Trump campaign and WikiLeaks over alleged election interference 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.