The national headquarters of Sigma Alpha Epsilon closed its University of Oklahoma chapter on Sunday after a video surfaced online showing its members singing a racist song about not allowing black students to join the fraternity. 

"There will never be a nigger at SAE," the students sang to the tune of "If You're Happy and You Know It," while dressed in formal attire and riding a bus. "You can hang him from a tree, but he'll never sign with me. There will never be a nigger at SAE." (The video clip is at the end of this article.)

In a statement Sunday, David Boren, Oklahoma's president, called the behavior "reprehensible," and promised an investigation. "If the reports are true, the chapter will no longer remain on campus," Boren said prior to SAE's announcement. Unheard OU, the student activist group that publicized the video, said it planned to protest on campus Monday. 

Touted as the only national fraternity founded in the antebellum South, Sigma Alpha Epsilon members agree to memorize and follow a creed known as The True Gentleman.

In 2013, the Washington University in St. Louis chapter of SAE was suspended after some of its pledges were instructed to direct racial slurs at a group of black students. Last year, 15 SAE members at the University of Arizona broke into a historically Jewish off-campus fraternity and physically assaulted its members while yelling discriminatory comments at them. In December, Clemson University's SAE chapter was suspended after the fraternity hosted a "cripmas" party where students dressed up as gang members.