Professor believes President Trump could have second-shortest presidency

There's a professor and historian in Florida who believes Donald Trump could have the second-shortest presidency ever. But there's reason to take his prediction with a grain of salt.

Let's start with some history. The shortest presidency belongs to William Henry Harrison, who died of pneumonia on his 32nd day in office. The second shortest belongs to James Garfield, who died on his 200th day in office. He was shot a little over two months after his inauguration and died a few months later.

RELATED: Presidential Historians Survey 2017: Presidential ranking

45 PHOTOS
Presidential Historians Survey 2017: Presidential ranking
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Presidential Historians Survey 2017: Presidential ranking

43. President James Buchanan

2009: 42
2000: 41

(Photo via Getty Images)

42. Andrew Johnson

2009: 41
2000: 40

(Photo by PhotoQuest/Getty Images)

41. President Franklin Pierce

2009: 40
2000: 39

(Photo by Hulton Archive/Getty Images)

40. President Warren G. Harding

2009: 38
2000: 38

(Photo by The Print Collector/Print Collector/Getty Images)

39. President John Tyler

2009: 35
2000: 36

(Photo by Hulton Archive/Getty Images)

38. President William Henry Harrison

2009: 39
2000: 37

(Photo by National Archive/Newsmakers)

37. President Millard Fillmore

2009: 37
2000: 35

(Photo by National Archive/Newsmakers)

36. President Herbert Hoover

2009: 34
2000: 34

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

35. Chester Arthur

2009: 32
2000: 32

(Photo via Getty Images)

34. President Martin Van Buren

2009: 31
2000: 30

(Photo via Getty Images)

United States President George W. Bush announces his plan for jobs and economic growth at the Economic Club of Chicago. His plan features $674 billion in tax cuts and benefits. (Photo by Brooks Kraft LLC/Corbis via Getty Images)
1864: Rutherford B Hayes (1822 - 1893), in his uniform as a Major General in the Union Army. Hayes later served as Republican Governer of Ohio and became the 19th President of the United States after winning the election of 1876. (Photo by MPI/Getty Images)
circa 1850: Millard Fillmore (1800 - 1874), 13th President of the United States of America. Fillmore was vice-president to Zachary Taylor and became President upon his death. (Photo by Hulton Archive/Getty Images)
377869 57: Zachary Taylor, twelfth President of the United States who served from 1849 to 1850. (Photo by National Archive/Newsmakers)
Benjamin Harrison, the 23rd President of the United States. Elected in 1888, Harrison was the grandson of William Henry Harrison, the 9th President of the United States. (Photo by Library Of Congress/Getty Images)
377869 20: Portrait of 20th United States President James A Garfield. (1881) (Courtesy of the National Archives/Newsmakers)
circa 1954: Studio headshot portrait of American vice president Richard Nixon (1913 - 1994) wearing a jacket and tie. (Photo by Hulton Archive/Getty Images)
(Original Caption) Calvin Coolidge is seen here, (1872-1933), the 30th President of the United States. This is a head and shoulders photograph.
American President Jimmy Carter (Photo by ?? David Rubinger/CORBIS/Corbis via Getty Images)
(Original Caption) President Gerald Ford is seen here in a head and shoulder 3/4 profile.
377869 75: William H. Taft, twenty-seventh President of the United States serving from 1909 to 1913. (Photo by National Archive/Newsmakers)
377869 24: Portrait of 24th United States President Grover Cleveland. (1837-1908) (Courtesy of the National Archives/Newsmakers)
General Ulysses S Grant, American soldier and politician, c1860s (1955). Ulysses Simpson Grant (1822-1885) commanded the Union (northern) army in the American Civil War from March 1864, leading it to final victory the following year. He was elected the 18th President of the United States in 1869, holding office until 1877. A print from Mathew Brady Historian with a Camera by James D Horan, Bonanza Books, New York, 1955. (Photo by The Print Collector/Print Collector/Getty Images)
377869 71: John Quincy Adams, sixth President of the United States serving from 1825 to 1829. (Photo by National Archive/Newsmakers)
WASHINGTON, DC -- CIRCA 1986: U.S. Vice President George H.W. Bush circa 1986 in in Washington, DC. (Photo by David Hume Kennerly/Getty Images)
John Trumbull, Portrait of John Adams (1735-1826), President of the United States (1797-1801), United States, Washington. National portrait gallery, . (Photo by: Photo12/UIG via Getty Images)
circa 1825: Andrew Jackson (1767 - 1845), seventh president of the United States of America. (Photo by Stock Montage/Stock Montage/Getty Images)
Portrait of James Madison, the 'Father of the Constitution,' by an unknown artist (oil on canvas from the White House collection, Washington DC), 1816. The portrait was commissioned by James Monroe. (Photo by GraphicaArtis/Getty Images)
377869 25: Portrait of 25th United States President William McKinley. (1897-1901) (Courtesy of the National Archives/Newsmakers)

15. President Bill Clinton

2009 rank: 15
2000 rank: 21

(Photo by Harry Hamburg/NY Daily News Archive via Getty Images)

14. President James K. Polk

2009 rank: 12
2000 rank: 12

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

13. President James Monroe

2009 rank: 14
2000 rank: 14

(Photo by DeAgostini/Getty Images)

12. President Barack Obama

2009 rank: N/A
2000 rank: N/A

(Photo credit ARIS MESSINIS/AFP/Getty Images)

11. President Woodrow Wilson

2009 rank: 9
2000 rank: 6

(Photo via Getty Images)

10. President Lyndon B. Johnson

2009 rank: 11
2000 rank: 10

(Photo by Berlin-Bild/ullstein bild via Getty Images)

9. President Ronald Reagan

2009 rank: 10
2000 rank: 11

(Photo by Bill Nation/Sygma via Getty Images)

8. President John F. Kennedy

2009 rank: 6
2000 rank: 8

(Photo via Getty Images)

7. President Thomas Jefferson

2009 rank: 7
2000 rank: 7

(Photo via Getty Images)

6. President Harry S. Truman

2009 rank: 5
2000 rank: 5

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

5. President Dwight D. Eisenhower

2009 rank: 8
2000 rank: 9

(Photo by Corbis via Getty Images)

4. President Theodore Roosevelt

2009 rank: 3
2000 rank: 2

(Photo via Getty Images)

3. President Franklin D. Roosevelt

2009 rank: 3
2000 rank: 2

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

2. President George Washington

2009 rank: 2
2000 rank: 3

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

1. President Abraham Lincoln

2009 rank: 1
2000 rank: 1

(Photo by Ann Ronan Pictures/Print Collector/Getty Images)

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Fast forward to 2017, and Ronald Feinman, an author and professor at Florida Atlantic University, thinks Donald Trump's presidency could max out somewhere between 31 and 199 days after inauguration day. That window opens Monday.

But, let's get some perspective here. Feinman outlines his prediction in a blog post, and his claim is based largely on opinion.

Certainly his forecast fuels the fire already burning amid Trump opponents.

SEE ALSO: Chelsea Clinton takes jab at Trump over Sweden remark

"Republicans love control and they would vastly prefer to see, as president, Mike Pence," professor Alan Lichtman told CBS News in November.

Congress holds the power to impeach presidents. And some lawmakers have suggested it.

"We have to find out more about him. And some of that, I think, leads to the possibility of impeachment," U.S. Rep. Maxine Waters, a D-Calif., told CNN in early February.

Rep. Mark Pocan, D-Wis., called on the president to retract his travel ban executive order in early February, saying, "Short of that, we'll have to take other actions, including legislative directives, resolutions of disapproval, and even explore the power of impeachment."

But on Sunday, a Politico article noted a Democratic effort to calm the impeachment talk, worrying it could backfire on the party.

There are certainly no known genuine efforts underway to oust Trump, and right now, all predictions of his term being anything less than four years are nothing but talk.

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