The professor and historian who accurately predicted the last nine presidential election outcomes is now predicting that Donald Trump’s impeachment is “inevitable.” The American University history professor said Democrats wouldn’t have gone this far if they weren’t confident they’d get the outcome they desire.

Allan Lichtman, who forecast Trump’s election win two months before the fact, told MSNBC yesterday that Democrats would never have taken the impeachment process this far if they were not confident of passing articles of impeachment against the president.

Speaking on the Weekends with Alex Witt show, Lichtman also said that Democrats had “helped themselves” and “diminished” Trump’s chances of being reelected in 2020 by launching an impeachment inquiry. “Impeachment is now inevitable,” Lichtman told Alex Witt. “The Democrats would never have taken it this far—we know how cautious Nancy Pelosi is—without actually voting articles of impeachment in the full house,” he said according to a report by Newsweek.

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Lichtman says “Tthe only question is the scope and content of those articles [of impeachment].” He did add: “But I can tell you that Democrats, by finally growing a spine, and moving forward on a pretty clear impeachment… have helped themselves,” he told MSNBC. “When Donald Trump becomes only the third American president to be impeached by the full House, that scandal key will have flipped against him, and diminished his chances for reelection.”

He also warned Democrats against putting a “time limit” on Trump’s impeachment. “There are some critical lessons here. Democrats, are you listening? The Nixon model shows you cannot put a time limit on impeachment. The Nixon investigation started out by looking at the Watergate burglary, and look what else they found over time. Illegal campaign contributions. Illegal wiretaps. Illegal break-ins.”

The latest predictions from Lichtman come ahead of further public impeachment inquiry hearings this week, following explosive testimonies from former U.S. Ambassador to Ukraine Marie Yovanovitch, State Department official George Kent and the top U.S. diplomat in Ukraine Bill Taylor last week.

The professor, famous for his succession of nine correct election predictions, said he was not ready to forecast who would win in 2020 just yet.