CNN host Brian Stelter on Sunday called for journalists to pursue more reporting on the issue of President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE's mental fitness, as speculation on the subject has ramped up in recent days.

“This past year has been full of reasons to question his fitness. President Trump promotes conspiracy theories. He shares racist videos on social media. He live-tweets Fox News shows that mislead him, while he derides real reporting as ‘fake news,’ ” Stelter said on his show “Reliable Sources.”

“But, journalists are not judges or doctors,” he continued. “This is not a court or a hospital. What this moment needs from reporters is more reporting. Not more speculating or guessing or rumor-mongering, but more real reporting of what’s going on.”

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Stelter and others have in recent days brought up Trump’s mental fitness following the president’s tweet about the size of his nuclear button and details in author Michael Wolff’s new book, “Fire and Fury: Inside the Trump White House.”

"When a president of the United States threatens North Korea by invoking the size of his nuclear button, it is fair to ask about his fitness,” Stelter said. “If a leader of another country were to do the same thing, I think many commentators, many reporters will conclude that he is not well.”

CNN analyst Van Jones on Sunday argued that those in charge of deploying the U.S. nuclear arsenal must be deemed mentally fit, so it's reasonable to apply the same standard to the president.

.@VanJones68 on #CNNSOTU: "The people who are actually in charge of the nuclear arsenal have to be evaluated, but the commander-in-chief does not. This is a reasonable thing to discuss" https://t.co/4YRUTa5HNO https://t.co/7pA8n8AtDs — CNN (@CNN) January 7, 2018

Trump responded Saturday to the discussion of his mental stability by tweeting that his “two greatest assets have been mental stability and being, like, really smart.” Other White House officials have downplayed questions about Trump's mental fitness.

Stelter’s comments come one day after fellow CNN host Michael Smerconish called debate over Trump’s mental fitness “unfair and unseemly.”

“I don’t think we should encourage this sort of speculation,” Smerconish said, calling it “inexact and subjective.”