The 2016 election was one that threw political prediction models out the window. Almost every professional pollster said President Donald Trump would end up losing by historic margins -- but there was one professor at American University who boldly predicted Trump's historic victory.

Through the use of a series of true or false questions, Allan Lichtman has been able to correctly predict every presidential election since 1984. And now, he is predicting Trump will face impeachment.

Presidential Historians Survey 2017: Presidential ranking



44 PHOTOS Presidential Historians Survey 2017: Presidential ranking See Gallery 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

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In his upcoming book, The Case for Impeachment, Lichtman's says Trump could get impeached because of his alleged ties to Russia and possible conflicts of interest with his businesses. Lichtman even forecasted Trump's impeachment before Election Day.

The professor is now saying he hopes people pay as much attention to his second prediction as his first, according to an advanced copy of his book he shared with POLITICO.

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"Taking time out of preparing to become the world's most powerful leader, he wrote me a personal note, saying 'Professor — Congrats — good call,'" Lichtman writes. "What Trump overlooked, however, was my 'next big prediction': that, after winning the presidency, he would be impeached."

Lichtman, a staunch Trump critic, uses past presidential impeachments to back his theory, saying the president's "disregard for lying in sworn testimony, examined in the context of the Bill Clinton precedent, shows how Trump's opponents could set an impeachment trap for him through a civil lawsuit."

"Justice will be realized in today's America not through revolution, but by the Constitution's peaceful remedy of impeachment, but only if the people demand it," Lichtman concludes in his book.

The publication is set to hit shelves on April 18th.

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