(PIX11/CNN) -- Rapper Waka Flocka has cancelled his scheduled performance at the University of Oklahoma after video of members of the Sigma Alpha Epsilon singing a racist chant surfaced.

Flocka was set to perform April 26 for the fraternity, but posted a message on his Instagram account stating he was "disgusted" by the video of some frat members cheerily chanting lines like "There will never be a n***** in S-A-E."

"SMFH.. I know for a fact the whole school and SAE don't agree with those kids actions so know that I'm not madd at the whole #SAE just those disgusting kids!!!!!! #WFF We can't change history but we damn sure can create our own future #DeathToRacism," he wrote.

University President David Boren has expelled the fraternity from the campus, and the men have until midnight to vacate the fraternity house. "The house will be closed, and as far as I'm concerned, they won't be back," he said, adding that the university is exploring what actions it can take against individual fraternity members.

SAE's national chapter has suspended the University of Oklahoma members and threatened lifelong suspensions for anyone responsible for the chant.