In a video posted to social media, Hegseth accused the cultural institutes of being propaganda tools disguised as academic programmes. He claimed that "80 new propaganda cells across 30 universities had popped up using different names and different charters, but with the same mission: to steal intellectual property and to infiltrate the minds of American students."
The Pentagon has added the Confucius Institutes to its list of institutions that threaten US national security. Hegseth said the defence department had spent the past two months "systematically dismantling every single one of these organizations."
The Chinese embassy in Washington did not immediately respond to a request for comment.
Confucius Institutes, which are funded by China's education ministry, have long faced accusations from US officials of serving as vehicles for propaganda and espionage. Previous administrations have taken steps to restrict their operations on American campuses, but Friday's designation marks the most direct national security classification by the Pentagon.