The former chairman of psychiatry at Duke University said Sunday during an interview with CNN's Brian Stelter that President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE may be responsible for more deaths than Adolf Hitler, Joseph Stalin and Mao Zedong.

"Calling Trump crazy hides the fact that we’re crazy for having elected him and even crazier for allowing his crazy policies to persist," Allen Frances, the author of "Twilight of American Sanity," said on CNN's "Reliable Sources." "Trump is as destructive a person in this century as Hitler, Stalin and Mao were in the last century. He may be responsible for many more million deaths than they were. He needs to be contained, but he needs to be contained by attacking his policies, not his person."

.@AllenFrancesMD, a psychiatrist, tells @Brianstelter: Trump "may be responsible for many more million deaths" than Adolf Hitler, Joseph Stalin, and Mao Zedong.https://t.co/cBUZVQjhNU pic.twitter.com/RVARyeVnVh — Julio Rosas (@Julio_Rosas11) August 25, 2019

The comments from Frances came during a panel discussion on CNN about Trump's mental fitness and whether psychiatrists should be allowed to weigh in publicly on the subject.

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Frances voiced opposition to the practice, saying that doing so can have "dire consequences."

"The first is that it stigmatizes the mentally ill. I’ve known thousands of patients. Almost all of them have been well-behaved, well-mannered, good people. Trump is none of these," he said. "Lumping the mentally ill with Trump is a terrible insult to the mentally ill, and they have enough problems and stigma as it is."

He then went on to compare Trump to leaders such as Hitler, Mao and Stalin. Hitler and his Nazi regime were responsible for approximately 11 million deaths, including the deaths of about 6 million Jews throughout Europe during the 1930s and 1940s.

Historians estimate that about 20 million people were killed under Stalin's rule in the Soviet Union between 1922 and 1952. Mao Zedong's Great Leap Forward campaign to transform the Chinese economy in 1957 led to between 20 and 45 million deaths, according to estimates.

Frances's comparison drew heavy pushback, with many questioning on social media why Stelter did not immediately confront the psychiatrist about the claim.

"The only thing 'Reliable' about Stelter is that he is reliably a leftwing hack," Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE, the president's son, said on Twitter.

The only thing "Reliable" about Stelter is that he is reliably a leftwing hack. https://t.co/qYJb07wMdQ — Donald Trump Jr. (@DonaldJTrumpJr) August 25, 2019

Stelter said on Twitter that he should have interrupted Frances following that statement but that he hadn't heard it due to technical difficulties.

"Not hearing the comment is my fault," he said.

I agree that I should have interrupted after that line. I wish I had heard him say it, but I was distracted by tech difficulties (that's why the show open didn't look the way it normally does, I had two computers at the table, etc). Not hearing the comment is my fault. — Brian Stelter (@brianstelter) August 25, 2019

Frances has been openly critical of Trump throughout his presidency. After Trump suggested mental illness played a factor in mass shootings, Frances tweeted that it was a "dirty trick to distract" from the evil posed by the National Rifle Association and the GOP.

Outrageous Trump tweet pins blame for #GunViolence on #mentalillness.



Dirty trick to distract from NRA/GOP evil.



Its the guns, stupid! https://t.co/MYrzHfcGMG — Allen Frances (@AllenFrancesMD) August 16, 2019

He's also tweeted is Trump was one of the main individuals responsible for America's decline.