Expert calls for new standards for presidential candidates amid growing concerns over Trump's mental health

Since he started his campaign for the presidency, many experts have discussed Donald Trump's mental health.

According to an opinion piece by psychiatrist Jeffrey Lieberman on The Hill, not only do diagnoses from psychiatrists violate the Goldwater Rule, which notes that it's unethical to make such claims without performing in-person assessments of public figures, but also, at this time, there is no standard for what constitutes adequate mental heath.

RELATED: The top 20 presidents in US history

21 PHOTOS
The top 20 presidents in US history, according to historians
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The top 20 presidents in US history, according to historians

20. George H. W. Bush

Best leadership quality and rank: International relations (No. 8)

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19. John Adams 

Best leadership quality and rank: Moral authority (No. 11)

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18. Andrew Jackson

Best leadership quality and rank: Public persuasion (No. 7)

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17. James Madison

Best leadership quality and rank: Moral authority (No. 9)

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16. William McKinley Jr.

Best leadership quality and rank: Relations with congress (No. 10)

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15. Bill Clinton 

Best leadership quality and rank: Economic management (No. 3)

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14. James K. Polk

Best leadership quality and rank: Crisis leadership (No. 9), Administrative skills (No. 9)

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13. James Monroe 

Best leadership quality and rank: International relations (No. 7)

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12. Barack Obama

Best leadership quality and rank: Pursued equal justice for all (No. 3)

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11. Woodrow Wilson

Best leadership quality and rank: Vision (No. 7)

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10. Lyndon Baines Johnson

Best leadership quality and rank: Relations with congress (No. 1)

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9. Ronald Reagan

Best leadership quality and rank: Public persuasion (No. 5)

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8. John F. Kennedy

Best leadership quality and rank: Public persuasion (No. 6)

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7. Thomas Jefferson

Best leadership quality and rank: Relations with congress (No. 5), Vision (No. 5)

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6. Harry S. Truman

Best leadership quality and rank: Crisis leadership (No. 4), Pursued equal justice for all (No. 4)

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5. Dwight D. Eisenhower 

Best leadership quality and rank: Moral authority (No.4)

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4. Theodore Roosevelt 

Best leadership quality and rank: Public persuasion (No. 2)

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3. Franklin D. Roosevelt
 
Best leadership quality and rank: Public persuasion (No. 1), International relations (No. 1)

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2. George Washington 

Best leadership quality and rank: Economic management (No. 1), moral authority (No. 1), Performance within the context of his times (No. 1)

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1. Abraham Lincoln 

Best leadership quality and rank: Crisis leadership (No. 1), administrative skills (No. 1), Vision (No. 1), Pursued equal justice for all (No. 1)

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Lieberman says, "The convention has been to provide a doctor's letter attesting to the candidates' health." However, he calls for examining more heath-related information, noting, "It is time to establish a standard for vetting the physical and mental health of candidates."

Some have questioned if Trump exhibits behaviors consistent with Narcissistic Personality Disorder.

SEE ALSO: How the Trump administration could still destroy Obamacare

According to Psychology Today, traits common among the affected include, "Grandiosity, a lack of empathy for other people, and a need for admiration," as well as a "struggle with criticism or defeat."

In mid-February, more than a dozen professionals in the field issued an open letter about Trump, saying he suffered "grave emotional instability" and is not fit to serve in a presidential capacity.

RELATED: US presidents in their younger days

44 PHOTOS
US presidents in their younger days
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US presidents in their younger days

This is the Naval Academy yearbook picture of a former president, can you guess who it is?

Click through to reveal the answer.

(Bettmann via Getty Images)

ANSWER: Jimmy Carter

(Photo by Dave Kotinsky/Getty Images)

This precious portrait was taken in the 1800's, do you recognize that face?

Click through for the answer. 

(Photo by Interim Archives/Getty Images)

ANSWER: Franklin Delano Roosevelt

(Bettmann via Getty Images)

This president served as a five-star general before his time in the White Hosue.

(Photo by © Hulton-Deutsch Collection/CORBIS/Corbis via Getty Images)

ANSWER: Dwight Eisenhower 

(Photo by Roger Viollet/Getty Images)

The president pictured here is posing with his older brother.

Did that hint help? Click through for another one.

(Photo by © CORBIS/Corbis via Getty Images)

Here is another picture of that president at a young age.

(Photo by John Springer Collection/CORBIS/Corbis via Getty Images)

ANSWER: Ronald Reagan

(Bettmann via Getty Images)

Can you guess who this young high school student is?

Click through to reveal the answer.

(Photo by Getty Images)

ANSWER: Bill Clinton

(REUTERS/Dominick Reuter)

This adorable six-month-old would later become President of the United States, click through to see who.

(Photo by Hulton Archive/Getty Images)

ANSWER: Harry Truman

(Bettmann via Getty Images)

This teen violinist went on to serve as president for two terms.

(Photo by Archive Photos/Getty Images)

ANSWER: Richard Nixon

(Photo by Ron Galella/WireImage)

Can you guess who this ten-year-old boy is?

Click to the next picture to see if you were right.

(Photo by Smith Collection/Gado/Getty Images).

ANSWER: Theodore Roosevelt 

(Bettmann via Getty Images)

This picture is from 1964.

Click through to see who this dapper teenager is.

(Copy Photo by Darren McCollester/Newsmakers)

ANSWER: George W. Bush

(REUTERS/Brendan McDermid)

When this picture was taken this future president was 21-years-old and owned a newspaper.

(Photo by Library of Congress/Corbis/VCG via Getty Images)

ANSWER: Warren G Harding  

(Photo by Stock Montage/Stock Montage/Getty Images)

This little 18-month-old grew up in Texas.

Click through to see who it is.

 (Photo by © CORBIS/Corbis via Getty Images)

ANSWER: Lyndon B. Johnson

(Photo by Keystone-France/Gamma-Keystone via Getty Images)

This nine-year-old future president was born in 1917.

 (Photo by © CORBIS/Corbis via Getty Images)

ANSWER: John F. Kennedy

(Bettmann via Getty Images)

This Naval Aviator Cadet is also a US president.

(REUTERS/Handout)

ANSWER: George H. W. Bush

(REUTERS/Kevin Lamarque)

This well-dressed future president was born in Nebraska.

(Photo by © CORBIS/Corbis via Getty Images)

ANSWER: Gerald Ford

(Photo by David Hume Kennerly/Getty Images)

This young basketball star would go on to serve two terms as president.

(Photo by Laura S. L. Kong/Getty Images)

This portrait features a US president who worked as a mining engineer before his time in the White House.

(Photo by Philipp Kester/ullstein bild via Getty Images)

ANSWER: Herbert Hoover

(Photo by: Universal History Archive/UIG via Getty Images)

ANSWER: Barack Obama

(Anadolu Agency via Getty Images)

This young man went on to become the 30th president of the United States.

(Bettmann via Getty Images)

ANSWER: Calvin Coolidge 

(Photo by Stock Montage/Stock Montage/Getty Images)

This president served as a lieutenant in the Mexican-American War.

(Photo by Interim Archives/Getty Images)

ANSWER: Ulysses S. Grant 

(Photo by Stock Montage/Stock Montage/Getty Images)

This handsome young man would go on to serve two terms as POTUS.

(Photo by Library of Congress/Corbis/VCG via Getty Images)

ANSWER: Woodrow Wilson

(Photo by: Liverani/Andia/UIG via Getty Images)

This sixteen-year-old boy would go on to become the 20th President of the United States.

(Photo by Interim Archives/Getty Images)

ANSWER: James Garfield

(Bettmann via Getty Images)

Can you pick out the president in this picture?

(Photo by © CORBIS/Corbis via Getty Images)

ANSWER: George H. W. Bush & George W. Bush

The picture was the father and son at Yale University when George Bush Jr. was a baby.

(REUTERS/Mike Stone)

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However, even though credentialed individuals are behind those opinions, the diagnoses suggested may not have any bearing on Trump's continued occupancy of the White House.

House Minority Leader Nancy Pelosi recently mentioned a proposal that "would require an independent medical assessment of the condition of the President, including mental health," reports CNN.

She commented, "If you're going to have your hands on the nuclear codes...we should probably know what mental state you're in."

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