On Dec. 6, the economic historian Phillip Magness emailed Princeton’s dean of faculty, Gene Jarrett, with evidence that Princeton historian Kevin Kruse plagiarized several passages of his 2015 book One Nation Under God.

“I am sharing this information in the interest of academic integrity,” Magness wrote. The email contained detailed comparisons between Kruse’s book and a 1956 New York Times article from which Kruse appears to have lifted passages without attribution.

The university never replied to Magness’s email, Magness told the Free Beacon, and has not announced an investigation of Kruse. Jarrett did not respond to a request for comment.

The university’s treatment of Kruse—a historian known for his searing criticism of conservative media—contrasts sharply with its scorched-earth approach to Joshua Katz, the classics professor who was fired last month after raising hell over the school’s racial politics.