DAYTONA BEACH, Florida (NBC) -- College graduates lobbed boos and catcalls at Education Secretary Betsy DeVos during a commencement address in Florida.
They stood, turning their backs on DeVos during graduation ceremonies at Bethune-Cookman University, an historically black college in Daytona Beach.
Students had protested the choice of commencement speaker for days, delivering petitions demanding DeVos not be allowed to deliver the speech.
But the school's president was apparently unmoved, and DeVos took the stage Wednesday.
The school president delivered a warning to the crowd.
"[boos and yelling] If this behavior continues, your degrees will be mailed to you," said Bethune-Cookman University President Edison Jackson.
Secretary DeVos has been criticized for saying that historically black colleges are the "real pioneers when it comes to school choice."
The schools were started because African-Americans weren't allowed to attend white universities and colleges.