A history professor whose formula has successfully predicted the outcome of all but one presidential election since 1984 has indicated that President Joe Biden is tracking to win in 2024.

Allan Lichtman, who has been teaching at American University for five decades, uses a system of 13 keys to the White House to make his call.

In a recent interview with the Guardian , Lichtman noted that Biden has already got two keys under his belt: the incumbency key, and the contest key, after he faced no serious contenders for the incumbent party nomination.

Thats two keys off the top. That means six more keys would have to fall to predict his defeat. A lot would have to go wrong for Biden to lose, Lichtman said.

He will likely make his final prediction in August, according to the Guardian.

The other keys, which are structured as true or false questions, include whether or not the incumbent candidate has been tainted by a major scandal, whether there has been social unrest during the term, whether the incumbent has achieved major military successes or failures, and whether or not the challenging candidate is charismatic or a national hero.