A professor with a strong record of predicting the outcome of U.S. elections is now forecasting that U.S. President Donald Trump will be impeached.

Allan J. Lichtman, a political historian at American University in Washington, D.C., and author of a new book titled “The Case for Impeachment,” was one of the few influential voices who predicted last fall that Trump would end up in the White House.

Before that, a prediction system Lichtman developed correctly called the winner of the popular vote in every U.S. presidential election since 1984.

In an interview with CTV News Channel Tuesday, Lichtman said Trump’s questionable actions before and after he took office could result in impeachment.

Lichtman said Trump still hasn’t divested himself from all of his business interests, and his family’s international business dealings could run afoul of constitutional rules.

“The American people…should not have to guess where the national interest leaves off and Trump’s pocketbook interest kicks in,” Lichtman said.

He said the “most likely path” to Trump’s impeachment would be “the Russian scenario” and the various investigations into the Trump team’s ties with Russia. 

If investigations by U.S. Senate and House intelligence committees uncover any collusion between the Trump team and Russian hacking attempts to influence the U.S. election, and Trump knew about it, “that’s a serious crime,” Lichtman said. 

“And if Trump himself, heaven forbid, was colluding with the Russians, he could become the first president charged with treason – an explicit ground for impeachment.”

Trump congratulated Lichtman for correctly calling his win, but the professor said he has not heard from the president about his latest political forecast.