The same professor who accurately predicted that Donald Trump will win the election is now predicting that he will also be impeached before 2018, and it will be by Republicans.

During an interview with Politico about his newest book, The Case for Impeachment, Professor Allan Lichtman claims that the Republicans will betray him and remove him from the White House.

Lichtman, who teaches history at American University, claimed that when the president and his transition team called him after the election, they only cared about part of his prediction and ignored the part where he predicted that he will also be impeached.

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

Lichtman, who is not a big supporter of Trump, feels that the president is not only a threat to the country, but an “existential threat” to the world.

“Trump’s policies and appointments pose an existential threat to humanity,” he wrote in one section of Case for Impeachment.

President Trump “threatens the institutions and traditions that have made America safe and free for 230 years,” Lichtman wrote early on in the book. “I’ll make clear why a Republican Congress might impeach a president of its own party.”

“Lichtman’s possible offenses that could get Trump to that point are familiar: charges of treason with Russia, abuse of power and emoluments violations,” said Politico. “Lichtman also cites now Attorney General Jeff Sessions, then a senator, who argued that a president could be impeached for offenses committed before he took office. Among those potential offenses, Lichtman lists Trump’s housing violations, charity problems, potential violations of the Cuba embargo and Trump University.”