Prof correct on 30 years of elections: Trump will win
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A professor who has accurately predicted the victor of every White House race since 1984 is not budging from his bet that Donald TrumpDonald John TrumpNew Bob Woodward book will include details of 25 personal letters between Trump and Kim Jong Un On The Money: Pelosi, Mnuchin talk but make no progress on ending stalemate | Trump grabs 'third rail' of politics with payroll tax pause | Trump uses racist tropes to pitch fair housing repeal to 'suburban housewife' Biden commemorates anniversary of Charlottesville 'Unite the Right' rally: 'We are in a battle for the soul of our nation' MORE will win this year.

“By the narrowest of possible margins, the keys still point to a Trump victory,” Allan J. Lichtman, professor of history at American University, told The Washington Post in an interview published Friday.

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Lichtman told the newspaper his system revolves around a set of 13 true or false statements about the party currently holding the White House.

The scholar said if six or more statements are false, the incumbent party loses the presidency come Election Day.

“Early on, the keys were inconclusive,” Lichtman said of the 2016 race. "And since that time, that sixth key has turned against the Democrats."

The decisive factor, he says, is the strength of third-party candidates. Libertarian presidential nominee Gary JohnsonGary Earl JohnsonState polling problematic — again Where Biden, Trump stand in key swing states Amash decides against Libertarian campaign for president MORE could siphon off 5 percent or more of the popular vote, based on current polling.

“That’s a big sign of discontent with the party holding the White House. And so, again on the knife edge, you had exactly six fatal keys against the incumbent Democrats.”

Also counting against Democrats in Lichtman's system: President Obama not being able to run as an incumbent, Republicans' 2014 midterm success, the lack of a large foreign policy or military success in Obama's second term and Democratic nominee Hillary ClintonHillary Diane Rodham ClintonThe Hill's Campaign Report: Biden, Harris make first public appearance as running mates Trump campaign spox rips GOP congressman over rejection of QAnon conspiracy Biden hits back after Trump's attacks on Harris MORE's lack of charisma and national hero status. 

Lichtman, who predicted Trump's victory in a separate interview last month, added his system currently foretells the Republican nominee winning the presidency, but that could change depending on two factors.

“[Johnson] could slip below that, which would shift the prediction,” he said of the Libertarian’s polling numbers, which would remove a "key" against the Democrats.

“The second qualification is Donald Trump. We have never seen anyone who is broadly regarded as a history-shattering, precedent-making, dangerous candidate who could change the patterns of history that have prevailed since the election of [former President] Abraham Lincoln in 1860."

Recent polls at both the national and state levels show a tightening race between Clinton and Trump less than two weeks from Election Day, though Clinton maintains a lead in most battlegrounds.